RU2729208C2 - Terminal, a base station and a communication method - Google Patents

Abstract

FIELD: wireless communications.

SUBSTANCE: terminal communicating with a base station comprises a high-level processor module, configured to implement one or more second physical downlink control channel (SPDCCH) settings through higher layer signaling from a base station and a receiving module, configured to perform SPDCCH monitoring, transmitted based on an extended subframe from a smaller number of symbols than a number of symbols corresponding to a subframe, and a resource block, set by SPDCCH channel setting, based on SPDCCH channel setting, SPDCCH channel is transmitted using control channel elements, which are formed by a plurality of resource element groups and in each of the resource block pairs set by the SPDCCH channel setting, group of resource elements is determined in association with a symbol in said pair of resource blocks.

EFFECT: high efficiency of a communication system in which a base station and a terminal communicate in terms of the time required for transmitting data.

11 cl, 18 dwg

Description

The technical field to which the invention relates

The present invention relates to a terminal, a base station, and a communication method.

State of the art

Radio access schemes and radio networks in cellular mobile systems (hereinafter also referred to here as LTE-Advanced (LTE-A), LTE-Advanced Pro (LTE-A Pro) or Evolved Universal Terrestrial Radio Access (EUTRA)) ) are subject to consideration by the 3rd Generation Partnership Project (3GPP) group. Further, in the following description, the term LTE encompasses the LTE-A, LTE-A Pro and EUTRA standards. In the LTE system, a base station is also called an evolved Node B (eNodeB), and a terminal (mobile station) is also called a user equipment (UE). The LTE system is a cellular communication system in which several areas served by base stations are organized in the form of cells. One base station can control multiple cells.

The LTE system is compatible with frequency division duplex (FDD) and time division duplex (TDD). An LTE system using frequency division (FDD) is also called FD-LTE or LTE FDD. FDD technology is a technology that allows full duplex communication in at least two frequency bands by applying frequency division multiplexing of the uplink signal and the downlink signal. LTE system using time division (TDD) is also called TD-LTE or LTE TDD. TDD is a technology that allows full duplex communication in a single frequency band by using time division multiplexing of the uplink signal and the downlink signal. Details regarding the FD-LTE and TD-LTE systems are given in Non-Patent Literature 1.

The base station maps the physical channel and the physical signal to the physical resources configured based on the predetermined frame configuration, and transmits the physical channel and the physical signal. The terminal receives this physical channel and the physical signal transmitted from the base station. In the LTE system, several types of frame configuration are specified, so that data transmissions are carried out using physical resources of a frame configuration corresponding to several types of frame configurations. For example, the type 1 frame configuration is applicable to the FD-LTE system and the type 2 frame configuration is applicable to the TD-LTE system. The details of the frame structure are set out in Non-Patent Literature 1.

In the LTE system, a given time interval is specified as a unit of time during which data is transmitted. This time interval is called the transmission time interval (TTI). For example, the TTI is one millisecond, in which case one TTI corresponds to the duration of one sub-frame. The base station and the terminal transmit and receive a physical channel and / or a physical signal based on the TTI. Details regarding the interval are set out in Non-Patent Literature 2.

Further, the TTI is used as a unit specifying a data transmission procedure. For example, according to the data transmission procedure, a hybrid automatic repeat request-acknowledgment (HARQ-ACK) report indicating whether the transmitted data was received correctly is transmitted after a period of time specified by an integer multiple of the interval TTI, after this data has been received. Therefore, the length of the time period (delay or latency) required for data transmission is selected depending on the size of the TTI. Such a data transfer procedure is described in Non-Patent Literature 3.

List of references

Non-patent literature

Non-Patent Literature 1: “Third Generation Partnership Project; Group radio access network, Technical conditions; Evolved Universal Terrestrial Radio Access Network (E-UTRA); Physical Channels and Modulation (Release 12) "(3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 12), 3GPP TS 36.211 V12.7.0 (2015 -09)).

Non-Patent Literature 2: “Third Generation Partnership Project; Group Radio Access Network, Technical Specifications; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); General description; Stage 2 (Issue 12) "(3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 12), 3GPP TS 36.300 V12.7.0 (2015-09)).

Non-Patent Literature 3: “Third Generation Partnership Project; Group radio access network, Technical conditions; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 12) "(3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical layer procedures (Release 12), 3GPP TS 36.213 V12.7.0 (2015-09 )).

Disclosure of the essence of the invention

Technical problem

In the LTE system, only one millisecond is specified as the TTI length, so that the physical channel and the physical signal are specified based on the TTI is 1 ms. Further, the length of the period of time required for data transmission is equal to an integer multiple of 1 ms. For this reason, in situations where the length of the time period required for data transmission is important, the size (duration) of the TTI affects performance. Further, when, in such a situation, several physical resources are sequentially allocated to the terminal in order to reduce the period of time required for data transmission, the transmission efficiency of the entire system is significantly degraded.

The present invention was developed in light of the problems described above, and the object of the invention is to provide a base station, terminal, communication system, communication method and integrated circuit capable of improving the efficiency of the overall system in terms of the time period required for data transmission in a communication system, in which base station and terminal communicate with one another.

Solution to the problem

According to the present invention, there is provided a terminal in communication with a base station, comprising: a high-level processor module configured to perform one or more physical downlink shortened control channel (SPDCCH) settings using higher-layer signaling from the base station; and a receiving unit, configured to monitor an SPDCCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by SPDCCH settings and SPDCCH settings. The SPDCCH is transmitted by one or more control channel elements. Such a control channel element is composed of several groups of resource elements. In each pair of resource blocks specified by the SPDCCH settings, a group of resource elements is specified in association with a symbol in that pair of resource blocks.

In addition, according to the present invention, there is provided a base station in communication with a terminal, comprising: a high-level processor unit configured to perform one or more SPDCCH settings in the terminal using higher-level signaling; and a transmitting unit, configured to transmit an SPDCCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by SPDCCH settings and SPDCCH settings. The SPDCCH is transmitted by one or more control channel elements. Such a control channel element is composed of several groups of resource elements. In each pair of resource blocks specified by the SPDCCH settings, a group of resource elements is specified in association with a symbol in that pair of resource blocks.

In addition, according to the present invention, there is provided a communication method used in a terminal in communication with a base station, and comprising: the step of performing one or more SPDCCH settings using higher layer signaling from the base station; and a step of monitoring the SPDCCH transmitted based on the extended subframe of fewer symbols than the number of symbols corresponding to the normal subframe and the resource block specified by the SPDCCH settings and based on the SPDCCH settings. The SPDCCH is transmitted by one or more control channel elements. Such a control channel element is composed of several groups of resource elements. In each pair of resource blocks specified by the SPDCCH settings, a group of resource elements is specified in association with a symbol in that pair of resource blocks.

In addition, according to the present invention, there is provided a communication method used at a base station in communication with a terminal, comprising: performing one or more SPDCCH settings at the terminal using higher layer signaling; and a step of transmitting an SPDCCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by the SPDCCH settings and based on the SPDCCH settings. The SPDCCH is transmitted by one or more control channel elements. Such a control channel element is composed of several groups of resource elements. In each pair of resource blocks specified by the SPDCCH settings, a group of resource elements is specified in association with a symbol in that pair of resource blocks.

Useful results of the invention

As described above, according to the present invention, it is possible to improve the efficiency of data transmission in a radio communication system in which a base station and a terminal communicate with each other.

Note that the effects described above are not necessarily limiting. Together or instead of the above effects, any of the effects that are noted in the present description or can be deduced from this description can be achieved.

Brief Description of Drawings

FIG. 1 is a diagram illustrating an example of a downlink subframe according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of an uplink subframe according to an embodiment of the present invention.

FIG. 3 is a simplified block diagram illustrating the configuration of a base station 1 according to an embodiment of the present invention.

FIG. 4 is a simplified block diagram illustrating the configuration of a terminal 2 according to an embodiment of the present invention.

FIG. 5 is a diagram illustrating a mapping example of downlink resource elements according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating an example of a TTI according to an embodiment of the present invention.

FIG. 7 is a diagram illustrating an example of a TTI according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating an example of a set of shortened physical downlink shared channel candidates (SPDSCH candidate channels).

FIG. 9 is a diagram illustrating an example of a SPDCCH set and an SPDSCH according to an embodiment of the present invention.

FIG. 10 is a diagram illustrating an example of a SPDCCH set, an SPDSCH, a PDCCH region, and a PDSCH according to an embodiment of the present invention.

FIG. 11 is a diagram illustrating a configuration example of a shortened resource element group (SREG) according to an embodiment of the present invention.

FIG. 12 is a diagram illustrating a configuration example of a shortened control channel element (SCCE) according to an embodiment of the present invention.

FIG. 13 is a diagram illustrating an example of transmitting an HARQ-ACK in response to an SPDSCH and a HARQ-ACK in response to a PDSCH.

FIG. 14 is a diagram illustrating a mapping example of SPDCCH and / or SPDSCH resource elements.

FIG. 15 is a block diagram illustrating a first example of a simplified configuration of an eNB to which the technology of the present invention can be applied.

FIG. 16 is a block diagram illustrating a second example of a simplified configuration of an eNB to which the technology of the present invention can be applied.

FIG. 17 is a block diagram illustrating a simplified configuration example of a smartphone 900 to which the technology of the present invention can be applied.

FIG. 18 is a block diagram illustrating an example of a simplified configuration of an in-car navigation device 920 to which the technology of the present invention may be applied.

Implementation of the invention

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that in this description and in the accompanying drawings, structural elements having substantially the same function and structure are assigned the same reference numerals, and repeated explanations of these structural elements are omitted.

A radio communication system according to an embodiment of the present invention

According to the present invention, a radio communication system comprises at least a base station 1 and a terminal 2. This base station 1 can serve several terminals. Base station 1 can be connected to another base station via the X2 interface. Further, base station 1 can be connected to an evolved packet core (EPC) via an S1 interface. Further, this base station 1 can be connected to a mobility management entity (MME) via an S1-MME interface, and can be connected to a serving gateway (S-GW) via an S1-U interface. This S1 interface supports many-to-many connections between the MME and / or S-GW and base station 1.

Frame configuration according to an embodiment of the present invention

In this embodiment, a radio frame is specified that is configured to have a duration of 10 ms (milliseconds). Each radio frame contains two half frames. The half-frame duration is 5 ms. Each half frame contains 5 sub frames. The duration of the sub-frame is 1 ms, and the sub-frame itself is formed by two consecutive time intervals (slots). The duration of such a slot is 0.5 ms. Thus, the i-th sub-frame in the radio frame contains the (2 × i) th slot and the (2 × i + 1) th slot. In other words, 10 subframes are specified in each radio frame.

The concept of a subframe encompasses a downlink subframe (first subframe), an uplink subframe (second subframe), a special subframe (third subframe), and so on.

The downlink subframe is a subframe reserved for downlink transmissions. An uplink subframe is a subframe reserved for uplink transmissions. The special subframe contains three fields. The three fields are the Downlink Pilot Time Slot (DwPTS), Guard Period (GP), and Uplink Pilot Time Slot (UpPTS). The total duration of these three DwPTS, GP and UpPTS fields is 1ms. The DwPTS field is a field reserved for downstream transmissions. The UpPTS field is a field reserved for upstream transmissions. The GP field is a field within which there are no downstream and upstream transmissions. Further, the special subframe may contain only the DwPTS field and the GP field, or may only contain the GP field and the UpPTS field. A special subframe is placed between the downlink subframe and the uplink subframe in TDD duplex format, and is used to switch from the downlink subframe to the uplink subframe.

One radio frame contains a downlink subframe, an uplink subframe, and / or a special subframe. Further, one radio frame may only contain a downlink subframe, an uplink subframe, or a special subframe.

Several radio frame configurations are supported. Such a radio frame configuration is specified by a frame configuration type. Frame type 1 configuration can only be applied in FDD mode. The type 2 frame configuration can only be applied in TDD mode. A type 3 frame configuration can only be used to operate in a licensed assisted access (LAA) cell.

Several uplink-downlink configurations are specified within the frame type 2 configuration. In the uplink-downlink configuration, each of the 10 subframes in one radio frame corresponds to one of the subframes of a downlink subframe, an uplink subframe, or a special subframe. Subframe 0, subframe 5, and DwPTS are permanently reserved for downlink transmissions. The UpPTS field and the subframe immediately following the special subframe are permanently reserved for upstream transmissions.

In a type 3 frame configuration, 10 subframes within one radio frame are reserved for downlink transmissions. Terminal 2 considers each subframe as an empty subframe. Until a given signal, a given channel, or a given downlink is detected in any subframe, terminal 2 assumes that there is no signal and / or channel at all in that subframe. This downlink transmission is exclusively occupied by one or more consecutive subframes. The first downlink subframe may start at any one in that subframe. The last downlink subframe can be either fully exclusively occupied or exclusively occupied by the timeslot specified in the DwPTS field.

Further, in a type 3 frame configuration, 10 subframes of one radio frame may be reserved for uplink transmissions. In addition, each of the 10 subframes in one radio frame may correspond to any one of the subframes — a downlink subframe, an uplink subframe, or a special subframe.

Base station 1 may transmit PCFICH, PHICH, PDCCH, EPDCCH, PDSCH, clock, and downlink reference signal in the DwPTS field of a specific subframe. Base station 1 may prohibit transmission of the PBCH in the DwPTS field of the special subframe. Terminal 2 may transmit PRACH and SRS in the UpPTS field of a specific subframe. In other words, terminal 2 may prohibit transmission of the PUCCH channel, the PUSCH channel, and the DMRS signal in the UpPTS field of the special subframe.

FIG. 1 is a diagram illustrating an example of a downlink subframe according to an embodiment of the present invention. The diagram shown in FIG. 1 is also referred to as the downlink resource grid. Base station 1 may transmit a downlink physical channel and / or a downlink physical signal in a downlink subframe from this base station 1 to terminal 2.

The downlink physical channel can be a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid automatic repeat request indicator channel. (PHICH), physical downlink control channel (PDCCH), enhanced physical downlink control channel (EPDCCH), physical downlink shared channel (PDSCH), physical multicast channel (PMCH); and some other similar channel. The downstream physical signal contains a synchronization signal (SS), a reference signal (RS), a discovery signal (DS), and some other similar signal. FIG. 1, only PDSCH and PDCCH regions are shown for simplicity.

The clock signal can be a primary synchronization signal (PSS), a secondary synchronization signal (SSS), or other similar signal. The downlink reference signal may be a cell-specific reference signal (CRS), a UE-specific reference signal associated with a PDSCH (PDSCH-DMRS :), demodulation reference signal ( DMRS)) associated with EPDCCH (EPDCCH-DMRS), positioning reference signal (PRS), channel state information (CSI) reference signal (CSI-RS), tracking reference signal (TRS) or other similar signal. The PDSCH-DMRS signal is also called the URS signal associated with the PDSCH, or simply the URS signal. The EPDCCH-DMRS signal is also called the EPDCCH-associated DMRS signal, or simply called the DMRS signal. PDSCH-DMRS and EPDCCH-DMRS signals are also referred to simply as DL-DMRS signals or downlink demodulation reference signal. The CSI-RS signal may be a non-zero power CSI-RS signal (NZP CSI-RS). Further, the downlink resources include a zero power CSI-RS signal (ZP CSI-RS), a channel state information-interference measurement (CSI-IM) signal, and the like.

FIG. 2 is a diagram illustrating an example of an uplink subframe according to an embodiment of the present invention. The diagram shown in FIG. 2 is also referred to as the uplink resource grid. Terminal 2 may transmit an uplink physical channel and / or an uplink physical signal in an uplink subframe from terminal 2 to an address of base station 1. The uplink physical channel may be a physical uplink shared channel (PUSCH), a physical uplink a physical uplink control channel (PUCCH), a physical random access channel (PRACH), or the like. The specified physical uplink signal may be a reference signal (RS).

The uplink reference signal may be an uplink demodulation signal (UL-DMRS), a sounding reference signal (SRS), or other reference signal. The UL-DMRS signal is associated with PUSCH or PUCCH transmission. The SRS signal is not associated with PUSCH or PUCCH transmission.

The downlink physical channel and the downlink physical signal are collectively referred to as the downlink signal. The uplink physical channel and the uplink physical signal are collectively referred to as the uplink signal. The downlink physical channel and the uplink physical channel are collectively referred to as the physical channel. The downlink physical signal and the uplink physical signal are collectively referred to as the physical signal.

BCH, MCH, UL-SCH, and DL-SCH are transport channels. The channel used by the medium access control (MAC) layer is called the transport channel. The unit of the transport channel used in the MAC layer is called a transport block (TB) or MAC protocol data unit (MAC PDU). At the MAC layer, hybrid automatic re-transmission request (HARQ) mode control is performed for each transport block. Such a transport block is a unit of data that the MAC layer transmits (supplies) to the physical layer. At the physical layer, a transport block is mapped to a codeword and an encoding procedure is performed for each codeword.

Physical resources according to the considered option

In this embodiment, one slot is defined by several symbols. The physical signal or physical channel transmitted in each slot is represented by the resource grid. In the downlink, the resource grid is formed by several subcarriers in the frequency axis direction and several OFDM symbols in the time axis direction. In the uplink, the resource grid is formed by multiple subcarriers in the frequency axis direction and multiple SC-FDMA symbols in the time axis direction. The number of sub-carriers or resource blocks can be determined depending on the bandwidth of the cell. The number of symbols in one slot is determined based on the type of cyclic prefix (CP). There are two types of CP prefixes - normal CP prefix or extended CP prefix. In the case of a conventional CP prefix, the number of OFDM or SC-FDMA symbols in one slot is 7. In the case of an extended CP, the number of OFDM or SC-FDMA symbols that make up one slot is 6. Each element in the resource grid is called a resource element. ... Such a resource element is identified using a subcarrier index (number) and a symbol index (number). Hereinafter, in the description of this embodiment, an OFDM symbol or an SC-FDMA symbol is also referred to simply as a symbol.

These resource blocks are used to map to resource elements of some physical channel (PDSCH, PUSCH, or other such channel). A collection of resource blocks contains virtual resource blocks and physical resource blocks. Some physical channel is mapped to a virtual resource block. These virtual resource blocks map to physical resource blocks. One physical resource block is formed by a given number of consecutive symbols in the time domain. The number of symbols and the number of subcarriers in one physical resource block is determined based on a set of parameters in accordance with the type of the CP prefix, the spacing between the subcarriers and / or higher layer in the cell. In the case of a normal CP prefix and a 15 kHz subcarrier spacing, the number of symbols in one physical resource block is 7 and the number of subcarriers is 12. In this case, one physical resource block contains (7 × 12) resource elements. The numbering of physical resource blocks in the frequency domain starts from 0. Further, two resource blocks in one subframe corresponding to the same physical resource block number are defined as a pair of physical resource blocks (PRB pair or RB pair).

A resource element group (REG) is used to define the display of a resource element and a control channel. For example, the REG is used to map the PDCCH, PHICH, or PCFICH. This REG consists of four consecutive resource elements that are part of the same OFDM symbol and are not used for the CRS signal in the same resource block. Further, such a REG consists of the first to fourth OFDM symbols in the first slot in some subframe.

The enhanced resource element group (EREG) is used to define the mapping of resource elements and the enhanced control channel. For example, the EREG group is used to display the EPDCCH channel. One pair of resource blocks contains 16 EREG groups. Each EREG is assigned a number from 0 to 15 for each pair of resource blocks. Each EREG contains 9 resource elements, excluding the resource elements used for the DM-RS signal associated with the EPDCCH in one resource block pair.

Antenna port according to the considered option

The antenna port is defined in such a way that a signal propagation channel carrying a certain symbol can be derived from a signal propagation channel carrying a different symbol at the same antenna port. For example, it can be assumed that different physical resources on the same antenna port are transmitted over the same signal propagation channel. In other words, for a symbol at a certain antenna port, it is possible to estimate and demodulate a signal propagation channel in accordance with a reference signal at that antenna port. Further, there is one resource grid for each antenna port. The antenna port is determined by means of a reference signal. Further, each reference signal can define multiple antenna ports.

In the case when the given condition is satisfied by two antenna ports, these two antenna ports can be considered as ports located supposedly together in one place (quasi co-location (QCL)). This predetermined condition is that the global response of a signal carrying a symbol at one antenna port can be inferred from a signal carrying a symbol at another antenna port. This global response can be delay variance, Doppler broadening, Doppler shift, average gain, and / or average delay.

Downlink physical channel according to the considered option

The PBCH is used to transmit a master information block (MIB), which is broadcast information specific to a particular cell served by base station 1. The PBCH is transmitted only in subframe 0 of the radio frame. The MIB can be updated at 40 ms intervals. The PBCH is transmitted multiple times with a period of 10 ms. In particular, the initial transmission of the MIB block is carried out in subframe 0 as part of a radio frame that satisfies the condition that the remainder obtained by dividing the system frame number (SFN) by 4 is equal to 0, and subsequent transmissions (repetitions) of the MIB block are performed in subframe 0 in all other radio frames. The SFN is the radio frame number (system frame number). The MIB is system information. For example, the MIB contains information indicating the SFN.

The PCFICH is used to transmit information regarding the number of OFDM symbols used to transmit the PDCCH. The area designated by the PCFICH is also called the PDCCH area. The information carried on the PCFICH is also called the control format indicator (CFI).

The PHICH is used to transmit a HARQ-ACK (HARQ request indicator, HARQ feedback, and response information) indicating (ACKnowledgment (ACK)) or negative ACKnowledgment (NACK) reception of uplink data (uplink shared channel (UL-SCH)) received by the base station 1. For example, if a HARQ-ACK indicating the ACK is received, the corresponding uplink data is not retransmitted. For example, if terminal 2 receives a HARQ-ACK indicating no reception (NACK), the terminal 2 retransmits the corresponding uplink data in a given uplink subframe. Some PHICH transmits a HARQ-ACK for some uplink data. Base station 1 transmits each HARQ-ACK for multiple uplink data segments included on the same PUSCH using multiple PHICHs.

The PDCCH and the EPDCCH are used to carry downlink control information (DCI). The mapping of the information bit from the composition of the downlink control information is defined as the DCI information format. Such downlink control information includes a downlink grant and an uplink grant. Downlink grant is also called downlink assignment or downlink allocation.

The PDCCH is transmitted using a set of one or more successive control channel elements (CCEs). The CCE contains 9 Resource Element Groups (REG). The REG contains 4 resource elements. In the case where the PDCCH is composed of n consecutive CCEs, transmission of this PDCCH begins with a CCE satisfying the condition that the remainder of the index (number) i of this CCE by n is 0.

The EPDCCH is transmitted using a set of one or more consecutive enhanced control channel elements (ECCE). The ECCE element contains several enhanced resource element groups (EREG).

A downlink grant is used to schedule the PDSCH in a cell. This downlink grant is used to schedule the PDSCH in the same subframe as the subframe in which the downlink grant is transmitted. An uplink grant is used to schedule a PUSCH in a cell. This uplink grant is used to schedule one PUSCH in the fourth subframe, counting from the subframe in which the uplink grant is transmitted or later.

A cyclic redundancy check (CRC) parity bit is added to the DCI information. This CRC parity bit is scrambled using a radio network temporary identifier (RNTI). This RNTI is an identifier specified or defined in accordance with the purpose of the DCI information or other similar data. The RNTI may be an identifier specified in the specification in advance, an identifier specified as cell specific information, an identifier specified as information specific to the terminal 2, or an identifier specified as information specific to a group to which belongs to terminal 2. For example, while monitoring PDCCH or EPDCCH, terminal 2 descrambles the parity bit of the CRC added to the DCI information using the specified RNTI and identifies whether the CRC is correct. In the case where the CRC is correct, the corresponding DCI information is recognized as DCI information for the terminal 2.

The PDSCH is used for downlink data transmission (downlink shared channel (DL-SCH)). Further, the PDSCH is also used to transmit higher layer control information.

The PMCH is used to carry multicast data (multicast channel (MCH)).

In the PDCCH domain, the signals of multiple PDCCHs can be multiplexed in frequency, time and / or space. In the EPDCCH region, signals from multiple EPDCCH channels can be multiplexed in frequency, time, and / or space. In the PDSCH region, signals from multiple PDSCHs can be multiplexed in frequency, time and / or space. PDCCH, PDSCH and / or EPDCCH signals can be multiplexed in frequency, time and / or space.

Downlink physical signal according to the considered option

To achieve synchronization of the terminal 2 in the downlink in the frequency domain and / or in the time domain, a clock signal is used. This sync signal can be a primary sync signal (PSS) or a secondary sync signal (SSS). The sync signal is inserted into a given subframe in the radio frame. For example, in TDD mode, the sync signal is placed in subframes numbered 0, 1, 5 and 6 within the radio frame. In FDD mode, the sync signal is placed in subframes numbered 0 and 5 within the radio frame.

The PSS clock can be used for coarse frame / time synchronization (time domain synchronization) or to identify a group of cells. The SSS clock can be used for more accurate frame timing or cell identification. In other words, time frame synchronization and cell identification can be performed using PSS and SSS timing signals.

The downlink reference signal is used by terminal 2 to estimate the characteristics of the downlink physical channel signal path, correct the signal path, calculate downlink status information (CSI), and / or measure the location of terminal 2.

The CRS signal is transmitted over the entire range of the sub-frame. This CRS signal is used to receive (demodulate) the PBCH, PDCCH, PHICH, PCFICH, and PDSCH. The CRS signal can be used by terminal 2 to compute downlink status information. The PBCH, PDCCH, PHICH, and PCFICH are transmitted through the antenna port used to transmit the CRS signal. The CRS signal supports configurations of 1, 2 or 4 antenna ports. The CRS signal is transmitted through one or more antenna ports 0 through 3.

The URS signal associated with the PDSCH is transmitted in a sub-frame and in the band used for transmission of the PDSCH with which the URS signal is associated. The URS signal is used to demodulate the PDSCH with which this URS signal is associated. The URS signal associated with the PDSCH is transmitted through one or more antenna ports numbered 5 and 7-14.

The PDSCH is transmitted through the antenna port used to transmit the CRS signal or the URS signal based on the transmission mode and DCI information format. DCI information format 1A is used for scheduling a PDSCH transmitted through an antenna port used to transmit a CRS signal. The 2D DCI information format is used for scheduling the PDSCH transmitted through the antenna port used to transmit the URS signal.

The DMRS signal associated with the EPDCCH is transmitted in a subframe and bandwidth used for transmission of the EPDCCH with which the DMRS signal is associated. The DMRS signal is used to demodulate the EPDCCH with which this DMRS signal is associated. The EPDCCH is transmitted through the antenna port used to carry the DMRS signal. The DMRS signal associated with the EPDCCH is transmitted through one or more antenna ports 107-114.

The CSI-RS signal is transmitted in a given subframe. The resources used for transmitting the CSI-RS signal are assigned by the base station 1. The CSI-RS signal is used for the terminal 2 to compute the downlink status information. This terminal 2 performs signal measurements (channel measurements) using the CSI-RS signal. The CSI-RS signal supports specifying some or all of the antenna ports 1, 2, 4, 8, 12, 16, 24 and 32. The CSI-RS signal is transmitted through one or more antenna ports 15 to 46. Next, the antenna port to be supported may be selected based on the capabilities of the terminal 2, the setting of the RRC control parameter and / or the transmission mode to be set.

The resources for the ZP CSI-RS signal are specified by a higher layer. The resources of the ZP CSI-RS signal are transmitted at zero output power. In other words, resources for the ZP CSI-RS signal are not transmitted. The ZP PDSCH and the EPDCCH are not transmitted using the resources for which the ZP CSI-RS signal is specified. For example, the resources of the ZP CSI-RS signal are used in a neighboring cell to transmit the NZP CSI-RS signal. Further, for example, the resources of the ZP CSI-RS signal are used for the CSI-IM measurements.

The CSI-IM measurement resources are defined by the base station 1. The CSI-IM measurement resources are used to measure interference during the CSI measurements. These resources for CSI-IM measurements can be set to overlap some resources for the CSI-RS signal. For example, in the case where resources for CSI-IM measurements are set to overlap some resources for the ZP CSI-RS signal, the signal from the cell that measures the CSI information is not transmitted on these resources. In other words, base station 1 does not transmit the PDSCH, EPDCCH, or the like using the resources specified for the CSI-IM measurements. Therefore, the terminal 2 can perform measurements of the CSI information efficiently.

The MBSFN RS signal is transmitted over the entire bandwidth of the subframe used for transmission of the PMCH. This MBSFN RS signal is used to demodulate the PMCH. This PMCH is transmitted through the antenna port used to transmit the MBSFN RS signal. The MBSFN RS signal is transmitted through antenna port 4.

The PRS signal is used by terminal 2 for measurements to locate this terminal 2. This PRS signal is transmitted through antenna port 6.

The TRS signal can only be mapped to specified subframes. For example, this TRS signal is mapped to subframes 0 and 5. Further, the TRS signal may use a configuration similar to part or all of the configuration for the CRS signal. For example, in each resource block, the position of the resource element to which the TRS signal is mapped can be made to match the position of the resource element to which the CRS signal for antenna port 0 is mapped. Further, the sequence (value) used for the TRS signal can be selected based on the information set on the PBCH, PDCCH, EPDCCH, or PDSCH (RRC control signaling). The sequence (value) used for the TRS signal may be selected based on a parameter such as a cell ID (eg, a cell ID in the physical layer), slot number, or the like. The sequence (value) used for the TRS signal can be determined using a method (formula) different from the method (formula) used to determine the sequence (value) used for the CRS signal at antenna port 0.

Physical uplink signal according to the considered embodiment

The PUCCH is a physical channel used to transmit uplink control information (UCI). This uplink control information contains downlink status information (CSI), a scheduling request (SR) indicating a resource request for the PUSCH channel, and a HARQ-ACK for downlink data (transport block (TB) or downlink together used channel (DL-SCH)). The HARQ-ACK acknowledgment is also called ACK / NACK acknowledgment, HARQ request feedback, or response information. Further, the HARQ-ACK for downlink data may indicate ACK, NACK, or discontinuous transmission (DTX).

The PUSCH is a physical channel used for uplink data transmission (uplink shared channel (UL-SCH)). Further, the PUSCH channel can be used to transmit the HARQ-ACK and / or channel status information along with the uplink data. Further, the PUSCH channel can be used to transmit only channel state information or only HARQ-ACK and channel state information.

The PRACH is a physical channel used to transmit the random access preamble. This PRACH can be used by the terminal 2 to achieve time-domain synchronization with the base station 1. Further, the PRACH is also used to indicate an initial connection setup procedure (process), a handover procedure between nodes, a connection re-establishment (recovery) procedure, synchronization (timing synchronization) for uplink transmissions and / or request for PUSCH resource allocation.

In the domain of PUCCHs, several such PUCCHs are multiplexed in frequency, time, space or code. In the PUSCH domain, several of these PUSCHs can be multiplexed in frequency, time, space or code. The PUCCH channel and the PUSCH channel are multiplexed in frequency, time, space or code. The PRACH can be placed in one subframe or two subframes. Several PRACHs can be code multiplexed.

The upward physical channel according to the considered option

The uplink DMRS signal may be associated with the transmission of the PUSCH channel or the PUCCH channel. The DMRS signal is time multiplexed with the PUSCH or PUCCH signal. Base station 1 may use the DMRS signal to perform path correction for the PUSCH channel or the PUCCH channel. In the description of this embodiment, the PUSCH transmission procedure also includes multiplexing and transmission of the PUSCH channel and the DMRS signal. In the described embodiment, the PUCCH transmission procedure also includes multiplexing and transmission of the PUCCH and the DMRS signal.

Further, the uplink DMRS signal is also referred to as UL-DMRS signal. The SRS signal is not associated with PUSCH or PUCCH transmission. Base station 1 may use the SRS signal to transmit uplink status information.

The SRS signal is transmitted using the last SC-FDMA symbol in the uplink subframe. In other words, the SRS is placed in the last SC-FDMA symbol in the uplink subframe. Terminal 2 may prohibit simultaneous transmissions of the SRS, PUCCH, PUSCH and / or PRACH on a specific SC-FDMA symbol in a specific cell. Terminal 2 may transmit the PUSCH and / or PUCCH using the SC-FDMA symbol, excluding the last SC-FDMA symbol in some uplink subframe in a specific cell in that uplink subframe, and transmits the SRS signal using the last SC-FDMA symbol in the subframe ascending line. In other words, terminal 2 can transmit SRS, PUSCH, and PUCCH in a specific uplink subframe in a specific cell.

Among the SRS signals, trigger type 0 SRS and trigger type 1 SRS are defined as different types of trigger SRS. A trigger type 0 SRS signal is transmitted when a parameter related to this type 0 trigger SRS signal is set by a higher signaling. The type 1 trigger SRS is transmitted when a parameter related to this type 1 trigger SRS is set by higher signaling, and is requested to transmit this signal by requesting the SRS included in DCI information in format 0, 1A, 2B , 2C, 2D or 4. Further, the SRS signal request is turned on in both FDD mode and TDD mode for DCI information in format 0, 1A, or 4, and only turned on in TDD mode for DCI information in 2B, 2C or 2D format. In the case where the transmission of the trigger type 0 SRS and the transmission of the trigger type 1 SRS are performed in the same subframe in the same serving cell, the transmission of the trigger type 1 SRS is given priority.

An example of the configuration of the base station 1 according to the considered option

FIG. 3 is a simplified block diagram illustrating the configuration of the base station 1 according to the present embodiment. As shown in FIG. 3, the base station 1 includes a high-level processor module 101, a control module 103, a receiving module 105, a transmitting module 107, and a transceiving antenna 109. Further, the receiving module 105 includes a decoding module 1051, a demodulating module 1053, a demultiplexing module 1055, a radio receiving module 1057, and module 1059 for measuring channel characteristics. Further, the transmitting unit 107 includes an encoding unit 1071, a modulating unit 1073, a multiplexing unit 1075, a radio transmitting unit 1077, and a downlink reference generator unit 1079.

The high-level processor module 101 handles data processing at the MAC layer, packet data convergence protocol (PDCP) layer, radio link control (RLC) layer, and radio resource control layer ( radio resource control (RRC)). Next, the high-level processing unit 101 generates control information for controlling the receiving unit 105 and the transmitting unit 107, and transmits this control information to the control unit 103.

The control unit 103 controls the receiving unit 105 and the transmitting unit 107 based on control information from the high-level processor unit 101. This control unit 103 generates control information for transmission to the high-level processor unit 101, and transmits this control information to the high-level processor unit 101. The control unit 103 receives the decoded signal from the decoding unit 1051 and the channel response estimate from the channel response unit 1059. The control unit 103 transmits the signal to be encoded to the encoding unit 1071. Further, this control unit 103 can be used to control the base station 1 as a whole or any part of it.

The high-level processing unit 101 performs data processing and control related to radio resource management, subframe setting, scheduling control, or control of transmission of the CSI information message. This data processing and control in the high-level processor unit 101 is performed for each terminal or for all terminals connected to the base station in general. Such data processing and control can only be performed by its own high-level processing unit 101, or the results of such processing and control can be received from a higher ranked communication site or from another base station.

In the course of radio resource management, the downlink data (transport block), system information, RRC control message (RRC control parameter) and / or MAC control element (CE) are generated and / or managed in the high processor unit 101.

As part of the sub-frame setting, the high-level processor unit 101 controls the sub-frame setting, the sub-frame structure setting, the uplink-downlink configuration setting, the uplink support setting for the uplink-downlink pair (UL-DL), and / or the downlink support setting. paired with UL-DL. Further, the tuning of the sub-frames in the high-level processor unit 101 is also referred to as tuning the sub-frames in the base station. Further, the setting of the subframes in the high processor unit 101 can be determined based on the uplink traffic volume and the downlink traffic volume. In addition, the setting of the sub-frames in the high processor unit 101 may be determined based on the scheduling results in the scheduling control process in the high processor unit 101.

During the scheduling control in the high-level processor unit 101, the frequency and subframe to which the physical channel (PDSCH and PUSCH) is assigned, coding rate, modulation scheme and transmission power of physical channels (PDSCH and PUSCH), and other similar characteristics are determined based on the received channel state information, the estimate value, the channel quality level, and other similar parameters of the signal propagation path from the channel response measurement unit 1059, and other similar objects. For example, the control unit 103 generates control information (in DCI format) based on the scheduling results obtained by the scheduling control in the high-level processor unit 101.

In the course of controlling the transmission of messages regarding information in the high-level processing unit 101, the transmission of messages regarding the CSI information from the terminal 2 is controlled. For example, the settings regarding the assumed reference resources for the CSI information are controlled in order to calculate the information in the terminal 2.

Under the control of the control unit 103, the receiving unit 105 receives the signal transmitted from the terminal 2 via the transmitting / receiving antenna 109, performs processing on the received signals such as demultiplexing, demodulation, and decoding, and transmits the processed information to the control unit 103. Further, the processing of the received signals in the receiving unit 105 is performed based on the settings specified in advance or the settings reported by the base station 1 to the terminal 2.

The radio receiving module 1057 converts the received signal to an intermediate frequency (downconversion), removes unnecessary frequency components, controls the gain to maintain the proper signal level, performs quadrature demodulation based on the I component and the quadrature component of the received signal, converts the analog signal into a digital signal, eliminates the guard interval (GI) and / or extracts the signal in the frequency domain by fast Fourier transform (FFT) of the uplink signal received through the transmit / receive antenna 109.

The demultiplexing unit 1055 separates the uplink signal, such as the PUCCH channel or the PUSCH channel, and / or the uplink reference signal from the input signal coming from the radio receiving unit 1057. This demultiplexing unit 1055 transmits the uplink reference signal to the channel response measurement unit 1059. The demultiplexing module 1055 compensates for the path characteristics of the uplink channel based on the estimated path characteristics of the signal path from the module 1059 measuring the characteristics of the channel.

The demodulating module 1053 demodulates the received signal for the modulation symbol from the upstream channel using modulation schemes such as binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 16-level quadrature Amplitude modulation (quadrature amplitude modulation (QAM)), 64-level QAM or 256-level QAM. A demodulating module 1053 separates and demodulates a multiplexed uplink signal in a multiple input / output (MIMO) system.

Decoding unit 1051 performs a decoding procedure on the coded bits of the demodulated uplink channel. The decoded uplink data and / or uplink control information is transmitted to the control unit 103. The specified decoding unit 1051 carries out the procedure for decoding the signal channel PUSCH for each transport block.

Channel response measurement unit 1059 measures an estimate value, channel quality metric, and / or other signal path characteristic for an uplink reference signal from demultiplexing unit 1055, and transmits said estimate value, channel quality index, and / or other signal path characteristic to demultiplexing module 1055 and / or to control module 103. For example, a path estimate for PUCCH or PUSCH path compensation is measured using the UL-DMRS signal, and the uplink quality is measured using the SRS signal.

The transmission unit 107 performs data processing for transmission such as coding, modulation, and multiplexing on downlink control information and downlink data from the high-level processing unit 101 under the control of the control unit 103. For example, the transmission unit 107 generates and multiplexes the PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signals, and generates a transmission signal. Further, the processing of data for transmission in the transmitting unit 107 is carried out based on the settings specified in advance, the settings reported by the base station 1 to the terminal 2, or the settings reported on the PDCCH or EPDCCH transmitted in the same subframe.

The encoding unit 1071 encodes the HARQ acknowledgment indicator (HARQ-ACK), downlink control information, and downlink data from the control unit 103 using a predetermined coding scheme such as block coding, convolutional coding, turbo coding, or the like. The modulating unit 1073 modulates the coded bits from the encoding unit 1071 using a predetermined modulation scheme such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. The downlink reference signal generator unit 1079 generates a downlink reference signal based on the physical cell identification (PCI) and the RRC control parameter set in terminal 2 and other similar information. The multiplexing unit 1075 multiplexes the modulated signal and the downlink reference signal for each channel and places the resulting data in a predetermined resource element.

The radio transmitter module 1077 performs signal processing such as transform to the time domain by inverse fast Fourier transform (IFFT), add a guard interval, generate a digital video signal, convert to an analog signal, quadrature modulation, convert an intermediate frequency signal to a high frequency signal (upconverted), removing excess frequency components and amplifying the power of the signal from the multiplexing unit 1075, and generates a transmission signal. The transmitted signal from the output of the radio transmitting module 1077 is transmitted through the transmitting receiving antenna 109.

An example of a terminal 2 configuration according to the considered option

FIG. 4 is a simplified block diagram illustrating the configuration of a terminal 2 according to an embodiment of the present invention. As shown in FIG. 4, terminal 2 includes a high-level processor module 201, a control module 203, a receiving module 205, a transmitting module 207, and a transmitting receiving antenna 209. Further, the receiving module 205 comprises a decoding module 2051, a demodulating module 2053, a demultiplexing module 2055, a radio receiving module 2057, and a module 2059 measurements of channel characteristics. Further, the transmitting unit 207 includes an encoding unit 2071, a modulating unit 2073, a multiplexing unit 2075, a radio transmitting unit 2077, and a downlink reference generator unit 2079.

The high-level processing unit 201 transmits uplink data (transport block) to the control unit 203. The high-level processing unit 201 carries out data processing in a medium access control (MAC) layer, a packet data downlink protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (RRC) layer. Further, the high-level processing unit 101 generates control information for controlling the receiving unit 205 and the transmitting unit 107, and transmits this control information to the control unit 203.

The control unit 203 controls the receiving unit 205 and the transmitting unit 207 based on control information from the high-level processor unit 201. This control unit 203 generates control information for transmission to the high-level processor unit 201, and transmits this control information to the specified high-level processor unit 201. The control unit 203 receives the decoded signal from the decoding unit 2051 and the channel response estimate from the channel response unit 2059. The control unit 203 transmits the signal to be encoded to the coding unit 2071. Further, this control unit 103 can be used to control the terminal 2 as a whole or any part of it.

The high-level processing unit 201 performs data processing and control related to radio resource management, subframe tuning, scheduling control, or message transmission control regarding CSI information. Said data processing and control in the high-level processor module 201 is performed based on settings specified in advance and / or based on control information specified or reported from base station 1. For example, control information from base station 1 comprises an RRC control parameter, a control element MAC layer or DCI information.

In the process of radio resource management in the high-level processor unit 201, tuning information in the terminal 2 is managed. In the radio resource management process, in the high-level processor unit 201, uplink data (transport block), system information, control message are generated and / or controlled. RRC (RRC Control Parameter and / or MAC Layer Control (CE).

As part of the subframe setting, the high-level processor unit 201 controls the subframe setting at the base station 1 and / or at the base station other than the base station 1. The subframe setting comprises setting up an uplink or downlink for subframes, setting a subframe structure, setting an uplink configuration. - downlink, an uplink pylon setting in an uplink-downlink (UL-DL) pair and / or a downlink pylon setting in a UL-DL pair. Further, setting the sub-frames in the high-level processing unit 201 is also referred to as setting the sub frames in the terminal.

In the scheduling control process, in the high-level processor unit 201, control information for scheduling control is generated in the receiving unit 205 and the transmitting unit 207 based on the DCI information (scheduling information) from the base station 1.

During the CSI reporting control, the CSI message transmission control is carried out in the high-level processor unit 201 to the address of the base station 1. For example, in the CSI reporting control, the settings related to the reference resources for CSI information are controlled. calculating the CSI information in the channel response measurement unit 2059. In a CSI message control process, resources (timing) used to communicate a CSI message are controlled based on the DCI information and / or the RRC control parameter.

Under the control of the control unit 203, the receiving unit 205 receives the signal transmitted from the base station 1 via the transceiver antenna 209, performs processing on the received signals such as demultiplexing, demodulation, and decoding, and transmits the processed information to the control unit 203. Further, the processing of the received signals in the receiving unit 205 is carried out based on the settings specified in advance or the settings reported by the base station 1.

The radio receiving module 2057 converts the received signal to an intermediate frequency (downconversion), removes unnecessary frequency components, controls the gain to maintain the proper signal level, performs quadrature demodulation based on the I component and the quadrature component of the received signal, converts the analog signal into a digital signal, eliminates the guard interval (GI) and / or extracts the signal in the frequency domain by Fast Fourier Transform (FFT) of the uplink signal received through the transmit / receive antenna 209.

A demultiplexing module 2055 separates a downlink signal such as a PHICH, a PDCCH, an EPDCCH or PDSCH, a downlink clock and / or a downlink reference signal from an input signal coming from a radio receiving module 2057. This demultiplexing module 2055 transmits an uplink reference signal line to module 2059 measuring channel characteristics. The demultiplexing module 2055 compensates for the path characteristics of the upstream channel based on the estimated path characteristics of the signal path from the module 2059 for measuring the characteristics of the channel.

The demodulating module 2053 demodulates the received signal for the modulation symbol from the downlink using a modulation scheme such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. A demodulating module 1053 separates and demodulates a multiplexed downlink signal in a multiple input / output (MIMO) system.

The decoding module 2051 performs the decoding procedure on the coded bits of the demodulated downlink. The decoded downlink data and / or downlink control information are transmitted to the control unit 203. This decoding unit 2051 carries out the procedure for decoding the PDSCH signal for each transport block.

Channel response measurement unit 2059 measures an estimate value, channel quality measure, and / or other signal path characteristic for the downlink reference signal from demultiplexing unit 2055, and transmits said estimate value, channel quality measure and / or other signal path characteristic to demultiplexing module 2055 and / or to control module 203. The downlink reference signal used for measurements by the channel response measurement unit 2059 may be determined based at least the transmission mode specified by the RRC control parameter and / or other RRC control parameters. For example, a path estimate for the PDSCH or EPDCCH is measured using the DL-DMRS signal to compensate for the path parameters. The estimation value for the signal path for compensating the parameters of the signal path for the PDCCH or PDSCH and / or for the downlink for communicating the CSI information is measured using the CRS signal. The downlink characteristics for communicating the CSI information are measured using the CSI-RS signal. The channel response measurement unit 2059 calculates the reference signal received power (RSRP) and / or the reference signal received quality (RSRQ) based on the CRS signal, CSI-RS signal, or acquisition signal, and transmits the calculated values of power RSRP and / or quality RSRQ in the processor module 201 high level.

The transmitting unit 207 performs data processing for transmission such as coding, modulation, and multiplexing on the uplink control information and uplink data from the high-level processor unit 201 under the control of the control unit 203. For example, transmitting unit 207 generates and multiplexes an uplink signal, such as a PUSCH channel or a PUCCH channel, and / or an uplink reference signal, and generates a transmit signal. Further, the processing of data for transmission in the transmitting unit 207 is performed based on the settings specified in advance or the settings specified or reported by the base station 1.

The encoding unit 2071 encodes the HARQ acknowledgment indicator (HARQ-ACK), uplink control information, and uplink data from the control unit 203 using a predetermined coding scheme such as block coding, convolutional coding, turbo coding, or the like. The modulating module 2073 modulates the coded bits from the encoder 2071 using a predetermined modulation scheme such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. An uplink reference signal generator unit 1079 generates an uplink reference signal based on the RRC control parameter set in terminal 2 and other similar information. The multiplexing unit 2075 multiplexes the modulated signal and the uplink reference signal for each channel and places the resulting data in a predetermined resource element.

The radio transmitting unit 2077 performs signal processing such as transform to the time domain by inverse fast Fourier transform (IFFT), add a guard interval, generate a digital video signal, convert to an analog signal, quadrature modulation, convert an intermediate frequency signal to a high frequency signal (up-convert frequency), removing unnecessary frequency components and amplifying the power of the signal coming from the multiplexing module 2075, and generates the transmitted signal. The transmitted signal from the output of the radio transmitting module 2077 is transmitted through the transmitting receiving antenna 209.

Method for transmitting control information according to the considered embodiment

Base station 1 and terminal 2 can use a variety of transmission methods (message, broadcast, or settings) of control information. The transmission of control information can be carried out at various levels. The control information transmission procedure comprises physical layer signaling, which is signaling at the physical layer, RRC control signaling, which is signaling at the RRC control layer, and MAC layer signaling, which is signaling at the MAC layer. RRC control signaling is a dedicated RRC control signaling for reporting specific control information to terminal 2, or general RRC control signaling for the purpose of reporting control information specific to base station 1. Signaling used by a layer higher than the physical layer, such as control signaling RRC and MAC layer signaling, also called higher layer signaling.

The RRC control signaling is carried out by transmitting the RRC control parameter. The MAC layer signaling is accomplished by transmitting a MAC layer control. Physical layer signaling is performed by transmitting downlink control information (DCI) or uplink control information (UCI). The RRC control parameter and the MAC layer control are transmitted using the PDSCH or the PUSCH. DCI information is transmitted using PDCCH or EPDCCH. UCI information is transmitted using the PUCCH channel or the PUSCH channel. RRC control signaling and MAC layer signaling are used to transmit semi-static control information, which is also called semi-static signaling. Physical layer signaling is used to convey dynamic control information and is also called dynamic signaling. DCI information is used for PDSCH scheduling or PUSCH scheduling. The UCI information is used to communicate messages regarding CSI information, an HARQ-ACK report, and / or a scheduling request (SR).

Details of control information according to the considered option

DCI information is reported using a DCI format having a field specified in advance. Specified in the DCI format, the specified bits of information are displayed in this field. The DCI information reports downlink scheduling information, uplink scheduling information, forward connection scheduling information, a request to transmit non-periodic messages regarding the CSI information, or an uplink power control command.

The DCI format monitored by terminal 2 is determined in accordance with the transmission mode specified for each serving cell. In other words, the portion of the DCI format controlled by the terminal 2 may differ depending on the transmission mode. For example, terminal 2, which is set to downstream mode 1, monitors DCI format 1A and DCI format 1. For example, terminal 2, which is set to downstream mode 4, monitors DCI format 1A and DCI format 2. For example, terminal 2 in which the upstream mode 1 is set monitors DCI format 0. For example, terminal 2 set to upstream mode 2 monitors DCI format 0 and DCI format 4.

The control area in which the PDCCH is placed for reporting DCI information to the terminal 2 is not previously reported to the terminal, so that the terminal 2 detects DCI information intended for this terminal 2 by blind decoding (blind detection). In particular, terminal 2 monitors a set of PDCCH candidate channels in a serving cell. This monitoring means that decoding attempts are made in accordance with all DCI formats that need to be monitored for each PDCCH in the set. For example, terminal 2 attempts to decode all aggregation levels, PDCCH candidate channels, and DCI formats that are likely to be transmitted to terminal 2. Terminal 2 considers DCI information (PDCCH) that is decoded (detected) successfully as DCI information (PDCCH ) for this terminal 2.

A cyclically redundant check code (CRC) is added to the DCI information. This CRC is used to detect errors in DCI information and blindly detect this DCI information. The parity bit of the CRC is scrambled using the RNTI. Terminal 2 determines whether the information in question is DCI information intended for this terminal 2 based on the RNTI. Specifically, the terminal 2 descrams the bit corresponding to the CRC using the RNTI, extracts the CRC, and determines whether the corresponding DCI is correct.

The RNTI is specified or set in accordance with the purpose or use of the DCI information. This RNTI may be a cell RNTI (cell-RNTI (C-RNTI)), a semi-persistent C-RNTI scheduling (SPS C-RNTI), a system information-RNTI (SI-RNTI) RNTI, paging RNTI (paging-RNTI (P-RNTI)), random access-RNTI (RA-RNTI), PUCCH transmit power control-PUCCH-RNTI (TPC-PUCCH- RNTI)), transmit power control-PUSCH-RNTI (TPC-PUSCH-RNTI)), RNTI, temporary C-RNTI, RNTI of multimedia broadcast multicast services (MBMS) -RNTI (M-RNTI))) or eIMTA-RNTI.

C-RNTI and SPS C-RNTI are terminal 2-specific RNTIs in base station 1 (cell) memory and serve to identify terminal 2. C-RNTI is used to schedule PDSCH or PUSCH in a specific subframe ... The SPS C-RNTI is used to activate or deactivate periodic resource scheduling for the PDSCH or PUSCH. A control channel having a CRC scrambled using the SI-RNTI is used for scheduling a system information block (SIB). A control channel having a CRC scrambled using the P-RNTI is used for paging control. A control channel having a CRC scrambled using the RA-RNTI is used to control the response to the RACH. A control channel having a CRC scrambled using the TPC-PUCCH-RNTI is used for power control on the PUCCH. A control channel having a CRC scrambled using the TPC-PUSCH-RNTI is used for power control on the PUSCH. A control channel having a CRC scrambled using a temporary C-RNTI is used by a mobile station in which such a C-RNTI is not set or recognized. A control channel having a CRC scrambled using the M-RNTI is used for scheduling MBMS services. A control channel having a CRC scrambled using eIMTA-RNTI is used to communicate information regarding the UL / DL TDD mode setting for a serving cell operating in dynamic TDD mode (eIMTA). In addition, the DCI format can be scrambled using any new RNTI instead of the above RNTI.

The scheduling information (downlink scheduling information, uplink scheduling information, direct connection scheduling information) contains information for scheduling in units of resource blocks or in units of resource block groups as scheduling in the frequency domain. A resource block group is a set of sequential resource blocks and indicates the resources allocated to the terminal for which to perform scheduling. The size of the resource block group is determined according to the system bandwidth.

Details of the downlink control channel according to the considered option

DCI information is transmitted using PDCCH or EPDCCH. Terminal 2 monitors a set of PDCCH candidates and / or a set of EPDCCH candidates for one or more activated serving cells as specified by RRC signaling. Here, monitoring means that the PDCCH and / or EPDCCH in a set corresponding to all DCI formats to be monitored are trying to decode.

The set of candidate channels PDCCH or the set of candidate channels EPDCCH is also called a search space. The search space defines a shared search space (CSS) and a terminal specific search space (USS). The CSS space can only be defined in the search space for the PDCCH.

The common search space (CSS) is a search space specified based on a parameter specific to base station 1 and / or a parameter specified in advance. For example, CSS space is a search space used as a common space for multiple terminals. Therefore, the base station 1 maps the control channel common to several terminals into the CSS space, and thereby reduces the amount of resources required to transmit the control channel.

A terminal specific search space (UE-specific search space (USS)) is a search space defined using at least one parameter specific to terminal 2. Therefore, the USS space is a search space specific to terminal 2, so that you can individually transmit the terminal 2 specific control channel. For this reason, the base station 1 can efficiently map the multiple terminal specific control channels.

The USS space can be set up to be shared by multiple terminals. Since a common USS space is set for multiple terminals, a terminal-specific parameter 2 is set equal to the same value for multiple terminals. For example, a structural unit that is assigned a parameter that is the same for several terminals may be a cell, a transmission point, a group of specified terminals, or other similar object.

The search space for each aggregation level is defined by a set of PDCCH candidates. Each PDCCH is transmitted using one or more CCEs. The number of CCEs used on one PDCCH is also referred to as the aggregation layer. For example, the number of CCEs used on one PDCCH can be 1, 2, 4, or 8.

The search space for each aggregation level is defined by a set of EPDCCH candidate channels. Each EPDCCH is transmitted using one or more sets of enhanced control channel elements (ECCE). The number of ECCEs used in one EPDCCH is also referred to as the aggregation layer. For example, the number of ECCEs used on one EPDCCH can be 1, 2, 4, 8, 16, or 32.

The number of PDCCH candidate channels or the number of EPDCCH candidate channels is determined based on at least the search space and the aggregation level. For example, in CSS space, the number of PDCCH candidates for aggregation levels 4 and 8 are early 4 and 2, respectively. For example, in USS space, the number of candidate PDCCHs for aggregation levels 1, 2, 4, and 8 is 6, 6, 2, and 2, respectively.

Each ECCE contains several EREGs. This EREG is used to define a mapping to an EPDCCH resource element. In each pair of RBs, 16 EREG groups are defined, which are assigned numbers from 0 to 15. In other words, groups from EREG 0 to EREG 15 are defined in each pair of RBs. For each RB pair, such groups EREG 0 to EREG 15 are preferably determined at regular intervals along the frequency axis for resource elements other than resource elements to which a given signal and / or channel is mapped. For example, such an EREG is not defined for a resource element onto which a demodulation reference signal associated with an EPDCCH transmitted through antenna ports 107 to 110 is mapped.

The number of ECCEs used in one EPDCCH depends on the EPDCCH format and is determined based on other parameters. This number of ECCEs used in one EPDCCH is also referred to as the aggregation layer. For example, the number of ECCEs used in one EPDCCH is determined based on the number of resource units that can be used to transmit the EPDCCH in one pair of RBs, the transmission method of the EPDCCH, and the like. For example, the number of ECCEs used in one EPDCCH may be 1, 2, 4, 8, 16, or 32. Further, the number of EREGs used in one ECCE is determined based on the subframe type and the cyclic prefix type, so that the number is 4 or 8. Both distributed transmission and localized transmission are supported as the transmission method of the EPDCCH.

Distributed transmission or localized transmission can be used for EPDCCH transmission. These methods, distributed transmission and localized transmission, differ from each other in the way that an ECCE is mapped to an EREG and a pair of RBs. For example, in the case of distributed transmission, one ECCE is configured using EREGs of multiple RB pairs. In the case of localized transmission, one ECCE is configured using an EREG from one pair of RBs.

Base station 1 tunes with respect to EPDCCH in terminal 2. This terminal 2 monitors multiple EPDCCHs based on tuning from base station 1. The set of RB pairs in which terminal 2 monitors EPDCCH can be specified. This set of RB pairs is also referred to as an EPDCCH set or EPDCCH-PRB set. One terminal 2 may have one or more EPDCCH channel sets specified. Each EPDCCH set contains one or more pairs of RBs. Further, settings regarding the EPDCCH channel can be made individually for each set of EPDCCH channels.

Base station 1 may set terminal 2 to a predetermined number of EPDCCH sets. For example, up to two sets of EPDCCH channels can be specified as set 0 EPDCCH channels and / or set 1 EPDCCH channels. Each of the EPDCCH channel sets may be composed of a predetermined number of RB pairs. Each set of EPDCCH channels constitutes one set of ECCE elements. The number of ECCEs configured in one set of EPDCCHs is determined based on the number of sets of RB pairs in the set of EPDCCHs and the number of EREGs used in one ECCE. In the case where the number of ECCEs configured in one EPDCCH set is N, each EPDCCH set forms ECCEs 0 through N-1. For example, in the case where the number of EREGs used in one ECCE is 4, the EPDCCH set is formed by 4 pairs of RBs constituting 16 ECCEs.

Details of information about the state of the channel according to the considered option

Terminal 2 reports the CSI information to the address of the base station 1. The time and frequency resources used for reporting the CSI information are controlled by the base station 1. In terminal 2, settings regarding the CSI information are made by RRC control signaling from this base station 1. In terminal 2, at a given the transmission mode is set to one or more CSI processing processes. The CSI information reported by this terminal 2 corresponds to such a CSI information processing process. For example, such a CSI processing process is a unit of control or setting regarding CSI information. For each of the processes for processing CSI information, settings for CSI-RS resources, CSI-IM measurement resources, periodic messages regarding CSI information (eg, message period and offset) and / or non-periodic messages regarding CSI information may be set independently.

The CSI information contains a channel quality indicator (CQI), a precoding matrix indicator (PMI), a precoding type indicator (PTI), a rank indicator (RI) and / or a CSI-RS resource indicator (CRI). The RI indicates the number of transmission levels (number of ranks). The PMI is information indicating a precoding matrix to be specified in advance. The PMI indicates one precoding matrix with one piece of information or two pieces of information. In the case where two pieces of information are used, the indicator is also referred to as the first PMI indicator and the second PMI indicator. The CQI is information indicating the combination of the modulation scheme and the code rate, specified in advance. The CRI is information (one event) indicating one CSI-RS resource selected from two or more CSI-RS resources in the case where two or more CSI-RS resources are specified for one CSI information processing. Terminal 2 reports CSI information for the recommendation to base station 1. This terminal 2 reports a CQI indicator satisfying a predetermined reception quality level for each transport block (codeword).

In the CRI report, one CSI-RS resource is selected for assignment from the plurality of CSI-RS resources. In a case where the CRI is reported, then the PMI, CQI and RI to be reported are calculated (selected) based on the reported CRI. For example, in the case where the CSI-RS resources to be set are precoded, the terminal 2 reports the CRI so that the precoding (beam) suitable for the terminal 2 is reported.

A subframe (messaging events) in which periodic messages with CSI information can be transmitted is determined according to a messaging period and a subframe offset specified by a higher layer parameter (CQIPMI, RI, and CRI). Further, the higher layer parameter can be set independently in the subframe set for measuring the CSI information. In a case in which only one piece of information is specified in multiple sets of subframes, this information may be common to these sets of subframes. In each serving cell, one or more periodic messages regarding CSI information are set by high-level signaling.

The CSI message type supports the PUCCH transmission mode for CSI messages. This type of CSI message is also referred to as a PUCCH message type. Type 1 messages support CQI feedback for the terminal selection subband. Type 1a messages support feedback of a subband CQI and a second PMI. Type 2, type 2b, type 2c messages support wideband CQI and PMI feedback. Type 2a messages support broadband PMI feedback. Type 3 messages support RI feedback. Type 4 messages support wideband CQI feedback. Type 5 messages support the feedback of a wideband RI and PMI. Type 6 messages support RI and PTI feedback. Type 7 messages support the feedback of a CRI and an RI. Type 8 messages support the feedback of a CRI, RI, and PMI for wide bandwidth. Type 9 messages support feedback of CRI, RI and PTI. Type 10 messages support the feedback of a CRI.

In terminal 2, information regarding CSI information measurements and CSI information messages is given by signals from base station 1. CSI information measurements are performed based on a reference signal and / or reference resources (e.g., resources for the CRS signal, resources for the CSI-RS signal, resources for CSI-IM measurements and / or resources for DRS). The reference signal used to measure the CSI information is determined based on transmission mode settings or the like. CSI measurements are made based on channel response measurements and interference measurements. For example, the power in the desired cell is measured by measuring channel characteristics. Signal power and noise power in a cell other than the desired cell are measured by measuring interference.

For example, while measuring CSI information, terminal 2 performs channel response and interference measurements based on the CRS signal. For example, when measuring CSI information, terminal 2 measures channel characteristics based on the CSI-RS signal and makes interference measurements based on the CRS signal. For example, while measuring CSI information, Terminal 2 performs channel measurements based on the CSI-RS signal and performs interference measurements based on CSI-IM measurement resources.

The process parameters of the CSI information processing are set in the form of information specific to the terminal 2 by means of higher layer signaling. In the terminal 2, one or more CSI information processing processes are set and CSI information is measured and messages are generated regarding the CSI information based on the settings of the CSI information processing process. For example, in a case where multiple CSI information processing processes are set, the terminal 2 independently reports multiple CSI information blocks based on these CSI information processing processes. Each CSI information processing process contains a setting for channel state information, a process identifier for the CSI information processing, setting information regarding the CSI-RS signal, setting information regarding CSI-IM measurements, a subframe structure for messages regarding CSI information, setting information for periodic messages regarding information CSI, setting information for non-periodic messages regarding CSI information. Further, the setting for the cell state information may be common to several CSI information processing processes.

Terminal 2 uses the reference resources for the CSI information to make measurements of the CSI information. For example, terminal 2 measures CSI information in the case where the PDSCH is transmitted using the downlink physical resource block group indicated by the reference resources for the CSI information. In a case in which a set of subframes for CSI information is specified by higher layer signaling, each reference resource for CSI information belongs to only one of the sets of subframes for CSI information and does not belong to both such sets of subframes for CSI information.

On the frequency axis, reference resources for CSI information are determined by a group of downlink physical resource blocks corresponding to ranges associated with a measured CQI value.

In the direction of the layers (spatial direction), the reference resources for the CSI information are determined by the RI and the PMI, the states of which are set by the measured CQI. In other words, in the direction of the layers (spatial direction), the reference resources for the CSI information are determined by the RI and the PMI, which are assumed or generated during the measurement of the indicator.

On the time axis, reference resources for CSI information are determined by one or more predetermined downlink subframes. In particular, the reference resources for the CSI information are determined by a valid subframe whose number is a predetermined amount less than the subframe number for communicating the CSI information. This predetermined number of subframes for determining the reference resources for the CSI information is selected based on the transmission mode, the type of frame configuration, the number of CSI information processing processes to be specified, and / or the reporting mode of the CSI information. For example, when the terminal 2 is set to one CSI information processing process and a periodic reporting mode on the CSI information, the specified predetermined number of subframes for determining the reference resources for the CSI information is 4 or more among the plurality of valid downlink subframes.

A valid subframe is a subframe that satisfies a given condition. A downlink subframe in a serving cell is considered valid when some or all of the following conditions are met:

(1) A valid subframe is a subframe in the ON state in the terminal 2 in which the RRC control parameters regarding the ON state and the OFF state are set;

(2) A valid downlink subframe is set as a downlink subframe in terminal 2;

(3) The valid downlink subframe is not a multimedia broadcast multicast service single frequency network (MBSFN) subframe in the specified transmission mode;

(4) The valid downlink subframe is not within the range of the measurement interval (measurement interval) set in the terminal 2;

(5) A valid downlink subframe is an element or part of a set of subframes for CSI information associated with periodic reporting of CSI information when a set of subframes for CSI is set in terminal 2 in a periodic reporting mode of CSI information; and

(6) A valid downlink subframe is an element or part of a set of subframes for CSI information associated with a downlink subframe associated with a corresponding CSI request in the DCI uplink non-periodic CSI messaging mode for the CSI information processing process. Under these conditions, the terminal 2 is set to a transmission mode, multiple processes for processing CSI information, and a set of subframes for CSI information specified for a process for processing CSI information.

Details of transmission using multiple carriers according to the considered option

Multiple cells are defined for terminal 2, so that terminal 2 can transmit on multiple carriers. The communication mode in which Terminal 2 uses multiple cells is called carrier aggregation (CA) or dual connectivity (DC) mode. The content set forth herein can be applied to each or some of a plurality of multiple cells defined in terminal 2. A cell defined in terminal 2 is also referred to as a serving cell.

In CA aggregation mode, the collection of multiple serving cells to be specified contains one primary cell (PCell) and one or more secondary cells (SCell). The specified one primary cell and one or more secondary cells can be specified in Terminal 2 supporting CA aggregation.

The primary cell is the serving cell in which the initial connection establishment procedure is performed, the serving cell where the connection re-establishment (recovery) procedure began, or the cell designated as the primary cell during handoff between nodes. This primary cell operates at the primary frequency. The secondary cell can be set after the connection is established or restored. The secondary cell operates at a secondary frequency. Further, this connection is also referred to as an RRC control connection.

Dual-connect (DC) mode is a mode of operation in which a given terminal 2 consumes radio resources provided from at least two different points in the network. Such a network point is a master base station (master eNB (MeNB)) and a secondary base station (secondary eNB (SeNB)). In the dual connection mode, terminal 2 establishes an RRC control connection through at least two network points. In this dual link mode, the two network points can be connected via a non-ideal backhaul.

In DC mode, base station 1 that is connected to at least S1-MME and plays the role of a mobility anchor of the core network is called a master base station. Further, the base station 1, which is not a master base station and provides additional radio resources to the terminal 2, is called a secondary base station. A serving cell group associated with a master base station is also called a master cell group (MCG). A serving cell group associated with a specified secondary base station is also called a secondary cell group (SCG).

In DC mode, the primary cell belongs to the MCG. Further, in the SCG, the secondary cell corresponding to the primary cell is called the primary secondary cell (PSCell). The functional (capabilities and characteristics) equivalent of a PCell (base station constituting a PCell) may be supported by a PSCell (a base station constituting a PSCell). Further, the PSCell can only support some of the functions of the PCell. For example, a PSCell may support a PDCCH transmission function using a search space other than CSS space or USS space. Further, the PSCell can be constantly active. Further, the PSCell is a cell that can receive the PUCCH.

In DC mode, a radio bearer (a date radio bearer (DRB)) and / or a signaling radio bearer (SRB) can be individually allocated via a MeNB or SeNB. The duplex mode can be set individually for each MCG (PCell) and SCG (PSCell). MCG (PCell) and SCG (PSCell) may not be synchronized with each other. A parameter (timing advance group (TAG)) for adjusting multiple timing signals can be independently set in MCG (PCell) and SCG (PSCell). In the dual connection mode, terminal 2 transmits UCI information corresponding to a cell in an MCG only through a MeNB (PCell) and transmits UCI information corresponding to an SCG only through a SeNB (pSCell). To transmit each UCI information, a PUCCH and / or PUSCH transmission method is applied in each group of cells.

The PUCCH and PBCH (MIB) are transmitted only through a PCell or PSCell. Further, the PRACH is only transmitted through a PCell or a PSCell until multiple TAG parameters are set between cells in a CG.

In a PCell or PSCell, semi-persistent scheduling (SPS) or discontinuous transmission (DRX) can be performed. In a secondary cell, the same DRX mode may be performed in a PCell or a PSCell in the same group of cells.

In the secondary cell, information / parameter regarding the MAC layer setting is generally shared with a PCell or a PSCell in the same group of cells. Several parameters can be set for each secondary cell. Some timers or counters can only be applied in a PCell or PSCell.

In Carrier Aggregation (CA) mode, a cell that uses TDD mode and a cell that uses FDD mode can be aggregated. In a situation where the aggregation of a cell in which the TDD mode is applied and the cell in which the FDD mode is applied, the present invention can be applied to either the cell in which the TDD mode is applied or the cell in which the FDD mode is applied.

Terminal 2 transmits information indicating the combination of bands in which terminal 2 supports CA aggregation to the address of base station 1. Terminal 2 transmits information indicating whether simultaneous transmission and reception is supported in multiple serving cells in several different bands for each band combination, in base station address 1.

Details of resource allocation according to the option under consideration

Base station 1 may employ several methods such as a PDSCH and / or PUSCH resource allocation method to terminal 2. The resource allocation method may comprise dynamic scheduling, semi-persistent scheduling, multiple sub-frame scheduling, and sub-frame cross-scheduling.

In the dynamic scheduling process, one block of DCI information is allocated in one subframe. In particular, the PDCCH or EPDCCH in a subframe scheduling the PDSCH in that subframe. The PDCCH or EPDCCH in a certain subframe scheduling for the PUSCH in a given subframe after a certain subframe.

When scheduling multiple subframes, one DCI block allocates resources in one or more subframes. In particular, the PDCCH or EPDCCH in a certain subframe scheduling for the PDSCH in one or more subframes after the specified number of subframes after the specified subframe. The PDCCH or EPDCCH scheduling the PUSCH in one or more subframes in a specified number of subframes after the specified subframe in a specified subframe. This specified number can be an integer equal to zero or more. This predetermined number may be specified in advance and may be determined based on physical layer signaling and / or RRC control signaling. In the process of scheduling multiple subframes, successive subframes may be scheduled, or subframes may be scheduled with a predetermined period. The number of subframes to be scheduled may be specified in advance or may be determined based on physical layer signaling and / or RRC control signaling.

In the process of cross scheduling subframes, one block of DCI information allocates resources in one subframe. In particular, the PDCCH or EPDCCH in a certain subframe scheduling for the PDSCH in one subframe a given number of subframes after the specified subframe. The PDCCH or EPDCCH scheduling the PUSCH in one subframe a predetermined number of subframes after the specified subframe in a specific subframe. This specified number can be an integer equal to zero or more. This predetermined number may be specified in advance and may be determined based on physical layer signaling and / or RRC control signaling. In the process of cross-scheduling subframes, successive subframes can be scheduled, or subframes can be scheduled with a predetermined period.

In a semi-persistent scheduling (SPS) process, one DCI block allocates resources in one or more subframes. In the case where SPS scheduling information is set by RRC control signaling and a PDCCH or EPDCCH is determined to activate SPS scheduling, the terminal 2 invokes the SPS scheduling procedure and receives the predetermined PDSCH and / or PUSCH based on the SPS scheduling setting. If a PDCCH or EPDCCH signal is detected to disable SPS scheduling when SPS scheduling is active, terminal 2 disables (deactivates) SPS scheduling and stops receiving the specified PDSCH and / or PUSCH. SPS scheduling can be disabled when a given condition is met. For example, when a predetermined number of blank transmission blocks is received, SPS scheduling is disabled. Transmitting empty data blocks to disable SPS scheduling corresponds to a MAC PDU containing a zero MAC service data unit (SDU).

The SPS scheduling information transmitted by the RRC control signaling contains the SPS C-RNTI which is the RNTI SPN, information regarding the period (slot) in which the PDSCH is scheduled, information regarding the period (slot) in which the PUSCH is scheduled, information regarding the setting to disable SPS scheduling, and / or the number of HARQ request mode procedures within the SPS scheduling. SPS scheduling is only supported in the primary cell and / or in the primary secondary cell.

Details of displaying resource elements in the downlink according to the considered option

FIG. 5 is a diagram illustrating a mapping example of downlink resource elements according to an embodiment of the present invention. In this example, a set of resource elements in one resource block pair will be described in the case when there is one resource block and when the number of OFDM symbols in one slot is 7. Further, seven OFDM symbols in the first half of the time axis in this resource block pair blocks are also called slot 0 (first slot). The seven OFDM symbols in the second half of the time axis in this pair of resource blocks are also referred to as slot 1 (second slot). Further, the OFDM symbols in each slot (resource block) are denoted by OFDM symbol numbers from 0 to 6. Further, the subcarriers along the frequency axis in this pair of resource blocks are denoted by the subcarrier numbers from 0 to 11. Further, in the case where the system bandwidth is composed from several resource blocks, a different number of subcarriers are allocated in this system band. For example, when the system bandwidth is composed of six resource blocks, subcarriers numbered from 0 to 71 are allocated and used in this band. Further, in the description of the considered embodiment, resource element (k, l) is a resource element denoted by subcarrier number k and number 1 OFDM symbol.

Resource elements designated R 0 through R 3 indicate the cell-specific reference signals for antenna ports 0 through 3, respectively. In the following, the cell specific reference signals for antenna ports 0 to 3 are also referred to as cell specific RS signals (CRS). In this example, the case of antenna ports is described in which the number of CRS signals is 4, but the number of antenna ports can be changed. For example, a CRS signal can use an antenna port or two antenna ports. Further, the CRS signal can be shifted along the frequency axis based on the cell ID. For example, the CRS signal can be shifted along the frequency axis based on the remainder of the cell ID divided by 6.

Resource elements C1 through C4 indicate reference signals (CSI-RS) for measuring signal path states for antenna ports 15 through 22. Resource elements designated C1 through C4 indicate CSI-RS signals in code multiplex groups ( code division multiplexing (CDM)) from CDM group 1 to CDM group 4, respectively. The CSI-RS signal is formed by an orthogonal sequence (orthogonal code) using a Walsh code and a scrambling code using a pseudo-random sequence. Further, the CSI-RS signal is code multiplexed using an orthogonal code such as a Walsh code in a CDM group. Further, this CSI-RS signal is frequency-division multiplexed (FDM) in the CDM group.

The CSI-RS signals from antenna ports 15 and 16 are mapped to C1. The CSI-RS of signals from antenna ports 17 and 18 are mapped to C2. The CSI-RS signals from antenna ports 19 and 20 are mapped to C3. The CSI-RS signals from antenna ports 21 and 22 represent C4.

Several antenna ports are specified for CSI-RS signals. These CSI-RS signals can be set as a reference signal corresponding to eight antenna ports, namely antenna ports 15 to 22. Further, the CSI-RS signal can be set as a reference signal corresponding to four antenna ports, namely antenna ports 15 - 18. Further, the CSI-RS signal can be set as the reference signal corresponding to two antenna ports, namely the antenna ports 15 to 16. Further, the CSI-RS signal can be set as the reference signal corresponding to one antenna port, and namely antenna port 15. This CSI-RS signal may be mapped to some subframes, and for example, this CSI-RS signal may be mapped to every two or more subframes. Several mapping schemes are specified for the resource element for the CSI-RS signal. Further, base station 1 can set multiple CSI-RS signals at terminal 2.

The CSI-RS signal can set the transmit power to zero. The zero transmit power CSI-RS signal is also referred to as the zero power CSI-RS signal. The zero power CSI-RS signal is set independently of the CSI-RS signal for the antenna ports 15 to 22. Further, the CSI-RS signal from the antenna ports 15 to 22 is also referred to as a non-zero power CSI-RS signal.

Base station 1 sets the CSI-RS signal as terminal 2-specific control information through RRC control signaling. In terminal 2, CSI-RS is set using RRC control signaling by base station 1. Further, in terminal 2, resources for CSI-IM measurements, which are resources for measuring interference power, may be set. Terminal 2 generates feedback information using resources for the CRS signal, CSI-RS signal and / or CSI-IM measurements based on settings from base station 1.

Resource elements designated D1 through D2 indicate DL-DMRS signals in CDM group 1 and CDM group 2, respectively. The DL-DMRS signal is generated using an orthogonal sequence (orthogonal code) using a Walsh code and a scrambling sequence in accordance with a pseudo-random sequence. Further, the DL-DMRS signal is independent for each antenna port and can be multiplexed within each pair of resource blocks. DL-DMRS signals are associated with one another by the orthogonality relationship between the antenna ports in accordance with code (CDM) and / or frequency (FDM) multiplexing. Each of the DL-DMRS signals is CDM multiplexed in a CDM group in accordance with orthogonal codes. DL-DMRS signals are frequency multiplexed (FDM) with one another between CDM groups. DL-DMRS signals in the same CDM group are mapped to the same resource element. For DL-DMRS signals in the same CDM group, different orthogonal sequences are used between the antenna ports, so that these orthogonal sequences are orthogonal to one another. The DL-DMRS signal for PDSCH can use some or all of the eight antenna ports (antenna ports 7-14). In other words, the PDSCH associated with the DL-DMRS signal can transmit in the MIMO system up to rank 8. The DL-DMRS signal for EPDCCH can use some or all of the four antenna ports (antenna ports 107 - 110). Further, the DL-DMRS signal may change the length of the spreading code for multiplexing CDM or the number of resource elements to be displayed according to the number of ranks in the associated channel.

The DL-DMRS signal for the PDSCH to be transmitted via antenna ports 7, 8, 11 and 13 is mapped to a resource element designated D1. The DL-DMRS signal for the PDSCH to be transmitted via antenna ports 9, 10, 12, and 14 is mapped to a resource element designated D2. Next, the DL-DMRS signal for the EPDCCH to be transmitted through the antenna ports 107 and 108 is mapped to a resource element designated D1. The DL-DMRS signal for the EPDCCH, to be transmitted via antenna ports 109 and 110, is mapped to a resource element designated D2.

HARQ request mode according to the considered option

In this embodiment, the HARQ request mode has various components. In HARQ mode, a transport block is transmitted and retransmitted. In the HARQ request mode, a predetermined number of processes (HARQ mode processes) are used (set), each process operating independently according to a stop and wait protocol.

On the downlink, the HARQ request mode is asynchronous and operates adaptively. In other words, in the downlink, retransmission scheduling is performed continuously using the PDCCH. In the uplink, the HARQ-ACK (response information) corresponding to the downlink transmissions is transmitted on the PUCCH channel or the PUSCH channel. On the downlink, the PDCCH communicates the HARQ request process number indicating the particular HARQ request process in question and information indicating whether the transmission in question is an initial transmission or a retransmission.

In the uplink, the HARQ request mode operates in a synchronous or asynchronous manner. In the downlink, the HARQ-ACK (response information) corresponding to the uplink transmission is transmitted on the PHICH. In the uplink HARQ request mode, the terminal operation is selected based on the HARQ request feedback received by the terminal and / or the PDCCH message received by the terminal. For example, in the case where the PDCCH is not received and the HARQ feedback is a positive ACK, the terminal does not transmit (retransmit) but stores the data in the HARQ request buffer. In this case, the PDCCH can be transmitted to resume retransmission. Further, for example, in the case in which the PDCCH is not received and the HARQ feedback is a negative NACK, the terminal non-adaptively retransmits in a given uplink subframe. Further, for example, when the PDCCH is received, the terminal transmits or retransmits based on the content of messages received on the PDCCH regardless of the HARQ request feedback content.

Further, in the uplink, if a predetermined condition (setting) is satisfied, the HARQ request mode can only operate in an asynchronous manner. In other words, the HARQ-ACK is not transmitted on the downlink, and on the uplink, retransmissions may be constantly scheduled on the PDCCH.

With a HARQ-ACK, the HARQ-ACK signal can indicate a positive ACK, a negative NACK, or a discontinuous DTX transmission. When the HARQ-ACK signal represents ACK, it means that the transport block (codeword and channel) corresponding to this HARQ-ACK has been received (decoded) correctly. When the HARQ-ACK signal represents NACK, it means that the transport block (codeword and channel) corresponding to this HARQ-ACK was received (decoded) incorrectly. When the HARQ-ACK signal represents DTX, it means, it means that the transport block (codeword and channel) corresponding to this HARQ-ACK is missing (not transmitted).

A predetermined number of HARQ request mode processes are specified (specified) for each downlink and uplink. For example, in FDD mode, up to eight HARQ request processes are used for each serving cell. Further, for example, in TDD mode, the maximum number of HARQ request processes is determined by adjusting the uplink / downlink ratio. The maximum number of HARQ request processes can be determined based on the round trip time (RTT). For example, if the RTT is 8 TTIs, the maximum number of HARQ request processes may be 8.

In an exemplary embodiment, the HARQ request information contains at least a new data indicator (NDI) and a transport block size (TBS). The NDI is information indicating whether the initial or retransmission of the transport block corresponding to the HARQ request information is performed. TBS size indicates the size of the transport block. Such a transport block is a data block in a transport channel (transport layer) and may be a unit for making a HARQ request. In DL-SCH transmissions, the HARQ request information also contains the HARQ request process ID (HARQ request process number). In UL-SCH transmissions, the HARQ request information also contains an information bit in which the specified transport block is encoded, and a redundancy version (RV) indication, which is information specifying a parity bit. In the case of spatial multiplexing in the DL-SCH, the corresponding HARQ request information contains a set of NDI and TBS size indications for each transport block.

TTI interval according to the considered option

FIG. 6 is a diagram illustrating an example of a TTI according to an embodiment of the present invention. In the example shown in FIG. 6, the TTI is 1 subframe. In other words, a unit of data transmission in the time domain such as a unit of PDCCH, EPDCCH, PDSCH, PUSCH, or HARQ-ACK is 1 subframe. Arrows between the downlink and uplink charts indicate the timing of transmissions in the HARQ request mode and / or the scheduling timing. The HARQ request mode timing and scheduling timing are specified or given in units of subframes, which are TTIs. For example, if some PDSCH signal is transmitted in downlink subframe n, the HARQ-ACK for that PDSCH signal is transmitted in uplink subframe n + 4, i. E. after 4 subframes. For example, if the PDCCH for uplink grant reporting is transmitted in downlink subframe n, the PUSCH corresponding to that uplink grant is transmitted in uplink subframe n + 4, i.e. after 4 subframes, and the HARQ-ACK for the PUSCH is transmitted on downlink subframe n + 8, i.e. after another 4 subframes. Further, in FIG. 6 shows an example in which a TTI is 1 subframe, while such a TTI may be equal to multiple subframes. In other words, the duration of the TTI may be an integer multiple of the length of one sub-frame.

FIG. 7 is a diagram illustrating an example of a TTI according to an embodiment of the present invention. In the example shown in FIG. 7, the TTI is 1 symbol. In other words, a unit of transmission of data in the time domain, such as PDCCH, EPDCCH, PDSCH, PUSCH, or HARQ-ACK data, is 1 symbol. Arrows between the downlink and uplink charts indicate the timing of transmissions in the HARQ request mode and / or the scheduling timing. The HARQ request mode timing and the scheduling timing are specified or specified in symbol units representing TTIs. For example, if some PDSCH signal is transmitted in downlink symbol n, the HARQ-ACK for that PDSCH signal is transmitted in uplink symbol n + 4, i. after 4 characters. For example, if the PDCCH for uplink grant reporting is transmitted in downlink symbol n, the PUSCH corresponding to that uplink grant is transmitted in uplink symbol n + 4, i. after 4 symbols, and the HARQ-ACK for the PUSCH is transmitted on symbol n + 8 of the downlink, i. e. after another 4 characters. Further, in FIG. 7 shows an example in which a TTI is 1 symbol, while such a TTI may be several symbols. In other words, the duration of the TTI may be an integer multiple of the length of one symbol.

The difference between FIG. 6 and FIG. 7 is that the TTIs are of different sizes (duration). Further, as described above, in the case where the HARQ request mode timing and scheduling timing are specified or set based on the TTI, these HARQ request mode timing and HARQ scheduling timing can be adjusted to an earlier time by decreasing the TTI value. Since the synchronization of the HARQ request mode and the scheduling synchronization are factors for determining system latency, decreasing the TTI reduces latency. For example, latency reduction plays an important role in the transmission of data (packets) intended for security purposes, as in an intelligent transport system. On the other hand, as the TTI decreases, the maximum TBS block size transmitted in one TTI also decreases, so that the overhead (unnecessary transmissions) in transmitting control information is likely to increase. Therefore, it is preferable that the value of the TTI is specified or set according to the purpose or use of the data. For example, the base station can specify or set the size (duration) and / or mode of the TTI in a cell-specific manner or in a terminal-specific manner. Further, in the case where the HARQ request mode timing and the scheduling timing are specified or set based on the TTI, the maximum value of the delayed TBS block size and / or one TTI can be adaptively set by changing the size (duration) of the TTI. Accordingly, efficient data transmission can be carried out in consideration of the delay. In addition, within the scope of the description of the present invention, a subframe, symbol, OFDM symbol, and SC-FDMA symbol may be interpreted as a TTI.

Settings related to TTI according to the considered option

In this embodiment, the sizes of several TTIs are specified. For example, several kinds (kinds of TTIs) are specified with respect to the sizes of these TTIs, and the base station sets such a mode in the terminal through higher layer signaling. The base station transmits data based on the type of TTI set in the terminal. This terminal transmits data based on the kind of TTI specified by the base station. This setting of the type of TTI can be carried out individually for each cell (serving cell).

The first kind of TTI is a kind in which the TTI is based on a subframe, and the second kind of TTI is a kind in which the TTI is based on a symbol. For example, the TTI shown in FIG. 6 is used as the TTI of the first kind, and the TTI shown in FIG. 7 is used as the second kind of TTI. Further, for example, for a TTI of the first type, the value of this TTI is equal to an integer multiple of the sub-frame duration, and for a TTI of the second type, the value of this TTI is equal to an integer multiple of the symbol duration. Further, for example, for a TTI of the first type, the value of this TTI is specified in units of subframes used in known systems, and for a TTI of the second type, the value of this TTI is specified in units of symbol duration, which is not used in the known art. Further, the TTI specified or set for the first type TTI is also called the first TTI, and the TTI specified or set for the second type TTI is also called the second TTI.

Various methods can be used to customize the appearance of the TTI. In one example of setting the TTI type, the first TTI type or the second TTI type is set at the terminal through higher layer signaling. When the first kind of TTI is set, data transmission is performed based on the first kind of TTI. When the second kind of TTI is set, data transmission is performed based on the second kind of TTI. In another example of setting the TTI type, the use of the second type TTIs (Long TTI or Short TTI (STTI)) is set at the terminal through higher layer signaling. If the second type of TTI is not specified, data transmission is performed based on the TTI of the first type. If the second type of TTI is specified, data transmission is performed based on the second TTI of the first type. Further, the second TTI is also called an extended TTI or a shortened STTI.

Tuning with respect to the STTI (STTI tuning) is done through RRC control signaling and / or physical layer signaling. The STTI setting contains information (parameter) regarding the size of the TTI, the setting relative to the downlink STTI (downlink STTI setting), the setting relative to the uplink STTI (setting the upward STTI), and / or information for monitoring the control channel with the purpose of reporting control information regarding the STTI. The STTI setting can be individual for each cell (serving cell).

A downlink STTI setting is a setting for transmitting (transmitting and receiving) a downlink (PDSCH, PDCCH and / or EPDCCH) in the STTI version and contains settings regarding the downlink in the STTI version. For example, tuning relative to the downlink STTI comprises tuning relative to the PDSCH in the STTI version, tuning relative to the PDCCH in the STTI version, and / or tuning relative to the EPDCCH in the STTI version.

An uplink STTI setting is a setting for transmitting (transmitting and receiving) an uplink channel (PUSCH channel and / or PUCCH channel) in an STTI version and contains settings relative to an uplink channel in an STTI version. For example, tuning with respect to an uplink STTI comprises tuning with respect to the PUSCH channel in the case of STTIs, and / or tuning relative to the PUCCH in the case of STTIs.

Information for monitoring a control channel for reporting control information regarding an STTI is an RNTI used to scramble a CRC added to the control information (DCI) regarding an STTI. This RNTI is also referred to as STTI-RNTI. Further, the STTI-RNTI may be set the same for both the downlink STTI and the uplink STTI, or it may be set on one of these lines independently of the other. Further, if multiple STTI settings are specified, the STTI-RNTI can be set the same for all of the interval settings, or it can be set for each setting independently.

The TTI size information is information indicating the TTI size in the case of STTIs (in other words, the STTI size). For example, the information regarding the size of the TTI comprises an indication of the number of OFDM symbols for setting the size of the TTI in units of OFDM symbols. Further, if information regarding the size of the TTI is not included in the settings of the STTI, the size of the TTI may be set to the value specified in advance. For example, if the information on the TTI size is not included in the STTI settings, the TTI size is equal to 1 symbol duration or 1 sub-frame duration. Further, the information regarding the size of the TTI may be set to the same for both the downlink STTI and the uplink STTI, or may be set on one of these lines independently of the other. Further, if multiple STTI settings are specified, the information regarding the size of the TTI may be set to the same for all STTI settings, or this information may be specified for each setting independently.

In the description of the present embodiment, the channel (STTI) in the STTI embodiment may be a downlink in an STTI embodiment and / or an uplink in an STTI embodiment. Tuning relative to the channel in the variant with STTI intervals (STTI channel tuning) contains tuning relative to the downlink channel in the variant with STTI intervals and / or tuning relative to the uplink channel in the variant with STTI intervals. The STTI PDCCH is also referred to as the shortened PDCCH (SPDCCH), further enhanced PDCCH (FEPDCCH), or reduced PDCCH (RPDSCH). The STTI PDSCH is also referred to as shortcut PDSCH (SPDSCH), enhanced PDSCH (EPDSCH), or reduced PDSCH (RPDSCH). The STTI PUSCH is also referred to as the PUSCH Shortcut (SPUSCH), the PUSCH Enhanced Channel (EPUSCH), or the PUSCH Reduced Channel (RPUSCH). The PUCCH channel in the STTI version is also called the PUCCH shortened channel (SPUCCH), the extended PUCCH channel (EPUCCH), or the reduced PUCCH channel (RPUCCH). Here, the STTI channel may be an SPDSCH channel, a SPUSCH channel, or a SPUCCH channel. A set of STTI channel settings can contain SPDSCH channel settings, SPUSCH channel settings, or SPUCCH channel settings. Here, the STTI channel may be an SPDCCH channel, an SPDSCH channel, a SPUSCH channel, or a SPUCCH channel. The set of STTI channel settings can contain SPDCCH channel settings (second PDCCH channel settings), SPDSCH channel settings (second PDSCH channel settings), SPUSCH channel settings (second PUSCH channel settings), or SPUCCH channel settings (second PUCCH channel settings).

In a contemplated embodiment, the data transmission and scheduling methods for the STTIs may employ various methods or schemes. For example, an STTI channel is mapped to some or all of a plurality of one or more periodic resources that are set or reported by higher layer signaling and / or physical layer signaling.

In this embodiment, the physical downlink control channel with TTIs of the first type is also referred to as PDCCH or first PDCCH, and the physical downlink control channel in the embodiment with TTIs of the second type is also called SPDCCH or second PDCCH.

In this embodiment, the physical downlink shared channel with TTIs of the first kind is also called PDSCH or first PDSCH, and the physical downlink shared channel with TTIs of the second kind is also called SPDSCH or second PDSCH.

In this embodiment, the physical uplink control channel with TTIs of the first kind is also called PUCCH or first PUCCH, and the physical uplink control channel in the TTI of the second kind is also called SPUCCH or second PUCCH.

In this embodiment, the physical uplink shared channel with TTIs of the first kind is also called PUSCH or first PUSCH, and the physical uplink shared channel with TTIs of the second kind is also called SPUSCH or second PUSCH.

The STTI channel is mapped based on resource subblocks. Such a resource sub-block is used to indicate the mapping of a given channel in the STTI to a resource element. One resource sub-block is defined by successive sub-carriers corresponding to one TTI in the time domain and successive sub-carriers corresponding to one resource block in the frequency domain. A certain resource sub-block may be configured to fit into only one resource block, or it may be configured to be located in two resource blocks in one pair of resource blocks, or it may not be configured to be located in several pairs of resource blocks.

The STTI channel signal is transmitted and received based on the extended subframe. Such an extended subframe is specified or set in accordance with the length of the TTI in the STTI case. For example, when the length of the TTI is 2 symbols, the extended subframe is specified or set to 2 symbols. The duration of the extended subframe is equal to the duration of the resource block. The extended subframe is specified or defined in accordance with fewer symbols than the number of symbols corresponding to a normal subframe. Such an extended subframe is also referred to simply as a subframe or short subframe.

Each of the transport blocks (codewords) in the channel in the STTI is transmitted using one or more resource subblocks within the same TTI.

The resources (resource sub-block) to which the channel (STTI) can be mapped in the STTI case by higher layer signaling and / or physical layer signaling are defined in the terminal. The set of resources to which a channel can be mapped in an STTI is also called a candidate STTI. Further, a set of candidate STTI channels given by one STTI channel setting is also called a candidate STTI channel set.

The set of candidate STTIs is indicated by a TTI with a given period in the time domain and a given resource block in the frequency domain. Several STTI channel settings can be made on the same STTI channel. In other words, in each candidate STTI channel set, the time domain period and / or the frequency domain resources may be set independently. In the case where multiple STTI channel settings can be made, the terminal can monitor a set of multiple predetermined candidate STTI channels.

The STTI channel setting contains STTI channel setting information in the time domain, STTI channel setting information in the frequency domain, and / or information regarding the HARQ-ACK for the STTI channel. Further, the STTI channel setting may further comprise information for monitoring the control channel for reporting information regarding the size of the TTI and / or control information regarding the STTI channel. The STTI channel setting information in the time domain is information for determining the resources of the candidate STTI channel. The frequency domain STTI channel setting information is information for determining the resources of a candidate STTI channel in the frequency domain.

The information for determining the resources of the candidate STTI channel may use various formats. The resources of the STTI channel in the frequency domain are defined (set, specified, or assigned) in units of resource blocks or in units of resource sub-blocks.

An example of STTI channel setting information in the time domain contains a predetermined number of TTIs and a predetermined number of TTI offsets. The TTI offset is an offset (offset) from the reference TTI, and is given in units of TTIs. For example, in the case where the TTI offset is 3, the set of candidate STTIs is set by including the TTI obtained by shifting 3 TTIs from the reference TTI. For example, in the case where the TTI period is 3, a set of candidate STTIs are set at intervals every two TTIs. When the period of the TTIs is 1, all consecutive TTIs are set.

In another example of the STTI channel setting information in the time domain, bitmap information indicating the TTI for the candidate STTI channel is used. For example, one bit in the bitmap information corresponds to a given number of subframes or to each of the TTIs in a given number of radio frames. When any particular bit in the bitmap information is 1, it indicates that the TTI corresponding to that bit is a TTI containing a candidate STTI. When a particular bit in the bitmap information is 0, it indicates that the TTI corresponding to this bit is not a TTI containing a candidate STTI. Specifically, when the TTI size is one subframe, the number of TTIs in five subframes is 70. In this case, the bitmap information is 70-bit information. This bitmap information is applied starting from the reference TTI and reapplied for each TTI corresponding to this bitmap information.

An example of STTI channel tuning information in the frequency domain uses bitmap information indicating resource subblocks of a candidate STTI channel or a set of resource blocks. For example, one bit in the bitmap information corresponds to each of a given number of resource block sets. When any particular bit in the bitmap information is 1, it indicates that the corresponding resource subblock included in the set of resource subblocks is a resource subblock containing a candidate STTI channel. When any particular bit in the bitmap information is 0, it indicates that the corresponding resource subblock included in the set of resource subblocks is not a resource subblock containing a candidate STTI channel.

Another example of STTI channel tuning information in the frequency domain uses a resource sub-block serving as a start and several consecutively allocated resource sub-blocks.

The set of resource subblocks is formed by a predetermined number of consecutive resource blocks in the frequency domain. The specified predetermined number of resource blocks constituting a set of resource blocks may be determined based on other parameters such as system bandwidth, or may be specified by RRC control signaling. In the description of the present invention, the specified set of resource sub-blocks simply contains the specified resource sub-block.

The resource sub-block specified by the STTI channel setting information in the frequency domain may be the same in all TTIs, or may switch (hop) at intervals equal to a predetermined number of TTIs. For example, a candidate STTI resource sub-block in a certain TTI is further determined using a number (index or information) indicating this TTI, and this candidate STTI resource sub-block is set differently for each TTI. Accordingly, a frequency diversity effect can be expected.

Information related to the HARQ-ACK for the STTI channel contains information regarding the resources for transmitting the HARQ-ACK message for the STTI channel. For example, when the STTI channel is an SPDSCH, the information regarding the HARQ-ACK for the STTI channel explicitly or implicitly indicates the uplink resources for the HARQ-ACK message for the SPDSCH.

When multiple STTI channel settings are specified for the same STTI channel, all STTI channel settings can be set independently, or some parameters may be common. For example, in a collection of several STTI channel settings, the STTI channel setting information in the time domain and the STTI channel setting information in the frequency domain may be set independently. For example, in a plurality of STTI channel settings, the STTI channel setting information in the time domain may be set common to all settings, and the frequency domain STTI channel setting information may be set independently. For example, in a plurality of STTI channel settings, the STTI channel setting information in the time domain may be set independently, and the frequency domain STTI channel setting information may be set common to all settings. Further, only some of the information segments can be set common, and the TTI period included in the STTI channel setting information in the time domain can be set common.

Some segments of information or some parameters specified by the STTI channel settings may be signaled through physical layer signaling. For example, the STTI channel setting information is reported through physical layer signaling.

In one example of a terminal operating in an STTI embodiment, the terminal operates only with higher layer signaling (RRC control signaling). When the STTI channel setting is set through higher signaling, the terminal starts monitoring or receiving the corresponding STTI channel. The terminal stops monitoring or receiving the corresponding STTI channel when the specified STTI channel setting is cleared by means of higher level signaling.

In another example of a terminal operating in an STTI embodiment, the terminal operates with higher layer signaling (RRC control signaling) and high layer signaling. When the STTI channel setting is set by higher layer signaling, and information (DCI) is reported to activate scheduling of the corresponding STTI channel by physical layer signaling, the terminal starts monitoring or receiving the corresponding STTI channel. When the STTI channel setting is specified by higher layer signaling, and information (DCI) for scheduling the corresponding STTI channel is reported through physical layer signaling, the terminal stops monitoring or receiving the corresponding STTI channel.

When multiple STTI channel settings are specified, information allowing scheduling of an STTI channel or information de-scheduling an STTI channel may be reported common to all STTI channels or independently for these channels.

When multiple STTI channel settings are specified and when candidate STTI channels specified differently collide in the same TTI (in other words, when multiple candidate STTI channels are specified in the same TTI), the terminal may monitor all candidate STTI channels; or monitor some candidate STTI channels. When only some of the candidate STTI channels are monitored, the terminal can determine the candidate STTI channel to monitor based on the predetermined priority. For example, this predetermined priority is determined based on the type of the STTI channel, an index (number) indicating the setting of the STTI channel, and / or an item (parameter) containing an indication of the capabilities of the terminal.

Details of the SPDCCH channel set according to the considered option

FIG. 8 is a diagram illustrating an example of an SPDSCH candidate set. In the example shown in FIG. 8, a first set of SPDCCH channels (first set of SPDCCH candidates) and a second set of SPDCCH channels (second set of SPDCCH candidates) are set at the terminal by a base station. The TTI size is 1 symbol. In the first set of candidate channels SPDCCH, the TTI is 2 and the TTI is 0. However, the TTI that is the reference for the TTI is the first 0 symbol shown in FIG. 8. In the second set of SPDCCH candidates, the TTI period is 3 and the TTI offset is 1. The SPDCCH candidate is also called the second PDCCH candidate. Further, the candidate SPDCCH can be specified to be set for all TTIs in advance. In this case, the TTI cycle and offset may not be specified.

The base station maps the SPDCCH for the terminal to one of the SPDCCH candidates set in the terminal and transmits the resulting data. The terminal monitors the set of SPDCCH candidates at the base station and receives the SPDCCH for that terminal.

An example of a method for determining whether an SPDCCH received by a certain terminal is addressed to that particular terminal and whether the channel is correctly received is a method of using an RNTI specific to that terminal (eg, STTI-RNTI). For example, each codeword (transport block) to which a predetermined CRC is added is scrambled using a terminal-specific RNTI and transmitted. Therefore, in the case where the terminal receives its SPDCCH, since each codeword is descrambled correctly, the terminal can determine that this SPDCCH is addressed to that particular terminal based on the added CRC code. On the other hand, when the terminal is different from the terminal to which the SPDCCH in question is assigned, since each codeword cannot be descrambled correctly, the other terminal can determine that this SPDCCH is not addressed to it based on the added CRC.

Another way to determine whether the SPDCCH received by a certain terminal is addressed to that particular terminal and whether the reception is correct is to include information indicating that the SPDCCH for a certain terminal is addressed to that particular terminal. For example, the SPDCCH for a specific terminal contains an RNTI specific to that terminal. For example, the CRC in the SPDCCH signal for a specific terminal is scrambled using an RNTI specific to that terminal.

The SPDCCH channel is used to carry DCI information. DCI information transmitted on the SPDCCH is used to schedule the SPDSCH. This SPDCCH transmitted in a certain TTI can schedule an SPDSCH in this TTI. Further, the SPDCCH transmitted in a certain TTI may schedule the SPDSCH in a TTI other than the TTI. For example, an SPDCCH transmitted in a TTI may schedule an SPDSCH in the x-th TTI, starting from the specified TTI. Here, “x” denotes a value specified in advance or a value specified by RRC control signaling. Further, the SPDCCH transmitted in a certain TTI can schedule multiple SPDSCHs in a given number of TTIs after the specified TTI. For example, an SPDCCH transmitted in a certain TTI may schedule multiple SPDSCHs in y TTIs after the specified TTI. Here, “y” is a value specified in advance or a value specified by control of the RRC signaling.

The candidate SPDCCH can be specified within the SPDCCH set by RRC control signaling. This set of SPDCCH channels corresponds to the STTI setting for the SPDCCH channel. This set of SPDCCH channels is also referred to as the SPDCCH-PRB set. The set of SPDCCHs is set to be specific to one terminal, however the same setting can be done for multiple terminals as well. Multiple sets of SPDCCH channels can be defined in one terminal.

The SPDCCH channel set can be specified in units of resource block pairs. The number of pairs of resource blocks specified as the set of SPDCCHs is set from a plurality of several types specified in advance. When multiple TTI lengths can be specified, the types of the number of resource block pairs specified as the SPDCCH set can be determined depending on the TTI length. For example, when the TTI length is 14 symbols, the number of resource block pairs that can be set can be 2, 4, or 8. When the TTI length is 7 symbols, the number of resource block pairs that can be set can be 4, 8, or 16. When the TTI length is 2 symbols, the number of resource block pairs that can be specified can be 4, 8, 16, or 32.

Multiple candidate SPDCCHs are defined in each of the TTIs within a pair of resource blocks defined by the SPDCCH set. Multiple candidate SPDCCH channels also form the SPDCCH channel search space. The number of candidate SPDCCHs in each TTI is specified or defined for each aggregation level. When multiple TTI lengths can be specified, the number of candidate SPDCCHs in each TTI can be determined depending on the length of the TTI.

SPDCCH channel monitoring according to the considered option

The channel set SPDCCH specifies or sets the USS and / or CSS search space. Further, in this set of SPDCCHs, only the terminal-specific USS space may be specified or specified. In other words, in such a set of SPDCCHs, the common CSS space is neither specified nor defined.

Various methods can be used to monitor a terminal when the SPDCCH channel set is specified on that terminal. As an example of monitoring, when a set of SPDCCHs is specified in a terminal, the terminal monitors its specific USS space on the SPDCCH and the general CSS space on the PDCCH. The terminal does not monitor the USS space on the PDCCH. Moreover, even when a set of SPDCCHs is set in the terminal, the terminal monitors USS space on the PDCCH in a sub-frame in which the terminal does not monitor USS space on the SPDCCH.

As another example of the monitoring method, in a case where a set of SPDCCHs is set in a terminal, the terminal monitors the USS space on the SPDCCH and the CSS space on the SPDCCH. The terminal does not monitor the PDCCH CSS space and the PDCCH USS space. Further, even in the case where the set of SPDCCHs is set in the terminal, in a subframe in which the terminal does not monitor the USS space on the SPDCCH and / or the CSS space on the SPDCCH, the terminal monitors the CSS space on the PDCCH and / or USS space on the PDCCH.

As another example of the monitoring method, when a set of SPDCCHs is set in a terminal, the terminal monitors CSS space and / or USS space on SPDCCH and CSS space and / or USS space on PDCCH. Further, in the case where the SPDCCH is received in some subframe, or in the case where the SPDSCH is scheduled in some subframe, the terminal assumes that the PDSCH is not scheduled in this subframe. In other words, the terminal assumes that no PDCCH is received in this subframe. If the PDCCH is detected, this PDCCH can be ignored. Further, in this case, only the PDCCH can be monitored.

As another example of the monitoring method, when a set of SPDCCHs is set in a terminal, the terminal monitors CSS space and / or USS space on SPDCCH and CSS space and / or USS space on PDCCH. Further, in a case where an SPDCCH is received in a subframe, or in a case where an SPDSCH is scheduled in a subframe, the terminal assumes that a PDSCH may be scheduled in that subframe. In other words, even in this case, the terminal schedules the PDCCH in this subframe.

As another example of a monitoring method, when a set of SPDCCHs is specified in a terminal, the terminal monitors CSS space and / or USS space on the SPDCCH, and CSS space and / or USS space on the PDCCH. Further, in a case where a PDCCH or an EPDCCH is received in a certain subframe, or an SPDSCH is scheduled in a certain subframe, the terminal assumes that the SPDSCH is not scheduled in that subframe. In other words, in this case, the terminal assumes that the SPDCCH is not received in this subframe. If SPDCCH is received, this SPDCCH can be ignored. Further, in this case, only the CSS space in the SPDCCH can be monitored.

As another example of a monitoring method, when a set of SPDCCHs is set in a terminal, the terminal monitors CSS space and / or USS space on the SPDCCH, and CSS space and / or USS space on the PDCCH. Further, in a case where a PDCCH or an EPDCCH is received in a subframe, or in a case where an SPDSCH is scheduled in a subframe, the terminal assumes that an SPDSCH can be scheduled in that subframe. In other words, even in this case, the terminal schedules the SPDCCH in this subframe.

In the same subframe, if both the SPDSCH and the PDSCH are scheduled for the terminal, the terminal assumes that the PDSCH is not mapped to a pair of RBs containing the resource element to which the SPDSCH is mapped.

In the case where both the SPDSCH channel and the PDSCH channel are scheduled for the terminal in the same subframe, in this terminal the PDSCH channel can be mapped even to a pair of RBs containing the resource element to which the SPDSCH channel is mapped, but then in channel PDSCH punctured or negotiated data rates on the resource element, which is mapped to the SPDSCH channel.

In the same subframe, when both the SPDSCH and the PDSCH are scheduled for the terminal, this terminal assumes that the SPDSCH is not mapped to the RB pair containing the resource element to which the SPDSCH is mapped.

The monitoring method can be determined according to the cell in which the SPDCCH channel set is specified. For example, in the case where the set of SPDCCHs is specified in a cell PCell, the terminal monitors the CSS space on the SPDCCH and the USS space on the SPDCCH in that cell. In the case where the set of SPDCCHs is specified in a PSCell, the terminal monitors the CSS space on the SPDCCH and the USS space on the SPDCCH in that cell. In the case where the set of SPDCCHs is specified in the SCell, the terminal monitors the CSS space on the PDCCH and the USS space on the SPDCCH in that cell.

In the case where the terminal monitors both PDCCH and SPDCCH in a subframe, the PDCCH can schedule transmissions of the SPDSCH under specified conditions. For example, in the case where the TTI for the resources to which the SPDSCH is mapped is included in the PDCCH region, the PDCCH in the PDCCH region may schedule the SPDSCH. Further, for example, in the case where the TTI for the resources to which the SPDSCH is mapped is the TTI immediately following the PDCCH area, the PDCCH in the PDCCH area may schedule the SPDSCH.

In the case where the PDCCH can schedule the SPDSCH, the terminal can further monitor the SPDCCH in the TTI for the resources to which the SPDSCH is mapped. For example, regardless of whether the PDCCH schedules the SPDSCH, the terminal monitors the SPDCCH in the TTI for the resources to which the SPDSCH is mapped. Further, for example, in the case where the PDCCH schedules the SPDSCH, the terminal does not monitor the SPDCCH in the TTI for the resources to which the SPDSCH is mapped. Further, for example, in the case where the PDCCH does not schedule the SPDSCH, the terminal monitors the SPDCCH in the TTI for the resources to which the SPDSCH is mapped. Further, for example, the terminal also assumes that the SPDSCH is scheduled by the PDCCH and that the SPDSCH scheduled by the SPDCCH is not mapped at the same time in some TTI.

Further, it can be determined whether the PDCCH can schedule the SPDSCH based on the terminal capability information. In other words, the terminal reports capability information to the base station indicating whether the SPDSCH can be scheduled by the PDCCH. The terminal determines whether the SPDSCH can be scheduled by the PDCCH through RRC control signaling.

In other words, it is possible to determine whether a control channel with a TTI of a first duration can schedule a shared channel with a TTI of a second duration based on the terminal capability information. In other words, the terminal reports its capabilities to the base station indicating whether a shared channel with a TTI of a second duration can be scheduled according to a control channel with a TTI of a first duration. The terminal determines whether a shared channel with a TTI of a second duration can be scheduled in accordance with a control channel with a TTI of a first duration through RRC control signaling.

The set of EPDCCH channels can be specified in the terminal, in which the set of SPDCCH channels can be specified. In other words, in the case where some terminal supports receiving the SPDCCH channel, that terminal also supports receiving the EPDCCH channel. Further, various methods can be used to configure a terminal in which a set of SPDCCH channels and a set of EPDCCH channels can be specified. As an example of such a setting, you can specify the setting of any one of the channel sets - the SPDCCH channel set and the EPDCCH channel set, in the terminal, in which the SPDCCH channel set and the EPDCCH channel set can be specified. In other words, the SPDCCH set and the EPDCCH set are not set simultaneously.

As another configuration example, both sets of SPDCCH channel set and EPDCCH channel set can be configured in a terminal in which these SPDCCH channel set and EPDCCH channel set can be specified, but monitoring in the same subframe is not specified. In other words, this terminal does not monitor both SPDCCH and EPDCCH in some subframe.

As another configuration example, both sets - the SPDCCH channel set and the EPDCCH channel set, are specified in the terminal, in which both sets - the SPDCCH channel set and the EPDCCH channel set can be specified, but in the case when in the same subframe monitoring both SPDCCH channel and EPDCCH channel, the number of SPDCCH candidates and / or the number of EPDCCH candidates is reduced compared to the case when only one channel is monitored - SPDCCH channel or EPDCCH channel.

The RNTI used to monitor the SPDCCH can be set regardless of the RNTI used to monitor the PDCCH. The RNTI used to monitor the SPDCCH can be set based on the parameters included in the SPDCCH setup. In other words, the RNTI used to scramble the CRC added to the DCI included in the SPDCCH can be set regardless of the RNTI used to scramble the CRC added to the DCI included in the PDCCH.

FIG. 9 is a diagram illustrating an example of a SPDCCH set and an SPDSCH according to an embodiment of the present invention. As shown in FIG. 9, the size of the TTI in the SPDCCH and the SPDSCH is two symbols long. The specified set of SPDCCH channels is defined in a predetermined pair of resource blocks in the terminal by the base station. The terminal monitors the candidate SPDCCH on the specified set of SPDCCHs and searches for the SPDCCH addressed to that terminal. In a case in which the terminal receives the SPDCCH addressed to the terminal, the terminal receives the SPDSCH scheduled by the DCI information included in the SPDCCH. FIG. 9 illustrates an example in which an SPDCCH and an SPDSCH addressed to a terminal are received in a TTI formed by # 2 and 3 and in a TTI formed by # 8 and 9.

FIG. 10 is a diagram illustrating an example of a SPDCCH set, an SPDSCH, a PDCCH region, and a PDSCH according to an embodiment of the present invention. As shown in FIG. 10, the size of the TTI in the SPDCCH and the SPDSCH is two symbols long. The specified set of SPDCCH channels is defined in a predetermined pair of resource blocks in the terminal by the base station. The terminal monitors the candidate SPDCCH on the specified set of SPDCCHs and searches for the SPDCCH addressed to that terminal. In a case in which the terminal receives the SPDCCH addressed to the terminal, the terminal receives the SPDSCH scheduled by the DCI information included in the SPDCCH. FIG. 10 illustrates an example in which SPDCCH and SPDSCH illustrates an example in which SPDCCH and SPDSCH addressed to a terminal are received in a TTI of # 8 and 9 and in a TTI of # 12 and 13. Further, FIG. 10 illustrates an example in which the PDCCH in the PDCCH domain schedules the PDSCH.

Part of the SPDCCH monitoring process described in this embodiment can be reformulated as follows.

The terminal in communication with the base station comprises a high-level processor module performing one or more second PDCCH settings via higher-level signaling from the base station, and a receiving module monitoring only the general search space and the terminal-specific search space in the first the PDCCH in the case in which the second PDCCH tuning is not performed, and monitoring the terminal-specific search space in at least the second PDCCH in the case in which the second PDCCH tuning is performed. The first PDCCH is transmitted based on a subframe determined according to a predetermined number of symbols. The second PDCCH is transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by the second PDCCH setting.

The terminal receiver does not monitor the terminal-specific search space on the first PDCCH in the case in which the second PDCCH tuning is performed. This terminal receiving unit further monitors the total search space on the first PDCCH in the case in which the second PDCCH tuning is performed. The terminal receiver unit then monitors the common search space on the second PDCCH in the case that the second PDCCH tuning is performed.

The setting combination in the resource block used for transmitting the second PDCCH is determined based on the number of symbols in the extended subframe specified by the second PDCCH setting. The minimum value included in the specified combination of preset values increases as the number of symbols in the extended subframe decreases. The minimum value included in the specified combination of preset values decreases as the number of symbols in the extended subframe increases.

The base station in communication with the terminal comprises a high-level processor module performing one or more second PDCCH settings via higher-layer signaling at the terminal, and a transmitting module mapping the first PDCCH to a common search space or a terminal-specific search space to the first PDCCH and transmitting the resulting PDCCH in the case where the second PDCCH setting is not performed, and also mapping the second PDCCH to a terminal-specific search space on at least the second PDCCH and transmitting the resulting PDCCH in the case of when the second PDCCH tuning is done. The first PDCCH is transmitted based on a subframe defined by a predetermined number of symbols. The second PDCCH is transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by the second PDCCH setting.

The terminal in communication with the base station comprises a receiving module monitoring a first PDCCH transmitted based on a subframe defined by a predetermined number of symbols and a second PDCCH based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe. , and a resource block specified by the second PDCCH setting. The first PDSCH allocated by the first PDCCH is mapped based on a pair of resource blocks corresponding to the number of symbols in the specified subframe. The second PDSCH allocated by the second PDCCH is mapped based on a resource subblock corresponding to the number of symbols in the extended subframe.

In the case where the first PDCCH is received in a given subframe, the second PDCCH is not received in that given subframe. In the case where the first PDCCH is received in a given subframe, the receiving module monitors only the total search space on the second PDCCH. In the case where the first PDSCH and the second PDSCH are allocated in a given subframe, the first PDSCH is displayed except for the resource block containing the resource subblock used for transmitting the second PDSCH.

In the case where the first PDSCH and the second PDSCH are allocated in a given subframe, the first PDSCH is allocated except for the resource element included in the resource sub-block used for transmitting the second PDSCH in the resource block containing the resource sub-block used for transmitting the second PDSCH ...

In the case where the second PDCCH is received in a given subframe, the first PDCCH is received in that given subframe. In the case where the second PDCCH is received in a given subframe, the receiving module monitors only the total search space on the first PDCCH.

In the case where the first PDSCH and the second PDSCH are allocated in a given subframe, the second PDSCH is mapped based on a resource subblock not included in the resource block used to transmit the first PDSCH.

The base station communicating with the terminal comprises a transmitting unit that transmits a first PDCCH transmitted based on a subframe defined by a predetermined number of symbols and a second PDCCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe. , and a resource block specified by the second PDCCH setting. The first PDSCH allocated by the first PDCCH is mapped based on a pair of resource blocks corresponding to the number of symbols in the specified subframe. The second PDSCH allocated by the second PDCCH is mapped based on a resource sub-block corresponding to a normal sub-frame.

Mapping details of SPDCCH resource elements and demodulation reference signal associated with SPDCCH according to the present embodiment

In the SPDCCH, resource elements are mapped based on a group of predetermined resource elements.

The search space for each aggregation level is defined by a set of SPDCCH candidate channels. Each SPDCCH is transmitted using one or more sets of shortened control channel elements (SCCE). The number of SCCEs used in one SPDCCH is also referred to as the aggregation level. For example, the number of ECCEs used on one EPDCCH is 1, 2, 4, 8, 16, or 32. Further, the combination of the number of SCCEs used on one SPDCCH can be specified based on the TTI length for the SPDSCH. Here, the SCCE is a control channel element used to transmit the SPDCCH. The SCCE is also referred to as an enhanced control channel element (FECCE).

The number of candidate SPDCCHs is determined based on at least the TTI length, search space and / or aggregation level. For example, in CSS space, the number of PDCCH candidates for aggregation levels 4 and 8 is 4 and 2, respectively. For example, in USS space, the number of candidate PDCCHs for aggregation levels 1, 2, 4, and 8 is 6, 6, 2, and 2, respectively.

Each SCCE contains several shortened resource element groups (SREG). The SREG group is used to map to resource elements of the SPDCCH. SREGs are also referred to as further enhanced resource element groups (FEREG).

FIG. 11 is a diagram illustrating a configuration example of a shortened resource element group (SREG) according to an embodiment of the present invention. In each pair of RBs, 14 EREGs are defined, which are assigned numbers from 0 to 13. In other words, in each pair of RBs, groups from SREG 0 to SREG 13 are defined. In each pair of RBs, SREGs 0 to SREG 13 are defined sequentially for each symbol for resource elements other than resource elements to which the specified signal or channel is mapped. For example, the SREG is not defined for the resource element to which the demodulation reference signal associated with the SPDCCH is mapped.

For example, the demodulation reference signal (SPDCCH-DMRS) associated with the SPDCCH is mapped to a resource element on a given subcarrier (subcarrier # 0, 5, and 10) in each pair of RBs. The specified subcarrier may be the same subcarrier as the demodulation reference signal (EPDCCH-DMRS) associated with the EPDCCH. In the example shown in FIG. 11, the target subcarrier is identical to the subcarrier to which antenna ports 107 and 108 are mapped.

The sequence generation method used for the SPDCCH-DMRS signal may be identical to the sequence generation method used for the EPDCCH-DMRS signal generation. For example, the sequence used for the SPDCCH-DMRS signal is generated based on a 2-bit orthogonal code mapped to two consecutive resource units along the time axis, similar to the sequence used for the EPDCCH-DMRS signal. In the example shown in FIG. 11, the SPDCCH-DMRS signal is displayed in units of two consecutive resource elements starting from the first resource element in a subframe. For example, the antenna ports for the SPDCCH-DMRS signal are ports 207 and 208 for two orthogonal codes. In other words, the SPDCCH-DMRS signal at antenna ports 207 and 208 may be a code multiplex signal using the same two consecutive resource elements.

Various methods can be used to map the antenna port resources for the SPDCCH-DMRS signal. As an example of the mapping method, the antenna port for the SPDCCH-DMRS signal is mapped to SREG. For example, in one example shown in FIG. 11, a resource element with odd-numbered SREGs corresponds to antenna port 207, and a resource element with odd-numbered SREGs corresponds to antenna port 208. This mapping method can be used for distributed SPDCCH transmissions.

As another example of the mapping method, the antenna port for the SPDCCH-DMRS signal is mapped to the SCCE. For example, resource elements included in the same SCCE correspond to antenna port 207 or 208 based on a given condition. This predetermined condition may be determined based on a value given or reported by the base station, a value such as an RNTI set at the terminal, and / or a value such as a base station-specific physical cell ID. This mapping method can be used for localized transmission of the SPDCCH.

As another example of the mapping method, the antenna port for the SPDCCH-DMRS signal is mapped to the SPDCCH channel. For example, resource elements included in the same SPDCCH correspond to antenna port 207 or 208 based on a given condition. This predetermined condition may be determined based on a value given or reported by the base station, a value such as an RNTI set at the terminal, and / or a value such as a base station-specific physical cell ID. This mapping method can be used for localized transmission of the SPDCCH.

As another example of the mapping method, the antenna port for the SPDCCH-DMRS signal is mapped to a resource element. For example, in each pair of RBs, antenna ports 207 and 208 for the SPDCCH-DMRS signal are mapped to resource elements other than the resource element to which the SPDCCH-DMRS signal is mapped, alternately from the first symbol with a priority given along the frequency axis. In other words, since the antenna ports 207 and 208 for the SPDCCH-DMRS signal are mapped to the same SREG, the diversity effect is enhanced. This mapping method can be used for localized transmission of the SPDCCH.

A method different from the example shown in FIG. 11 can be used to map resource elements in a pair of RBs for the SPDCCH-DMRS signal. For example, the SPDCCH-DMRS signal is mapped to resource elements on specified subcarriers (subcarriers # 1, 6, and 11) in each pair of RBs. The specified specified subcarrier is identical to the subcarrier to which antenna ports 109 and 110 are mapped for the EPDCCH-DMRS signal. In this case, the antenna ports for the SPDCCH-DMRS signal may be ports 209 and 210. Further, the antenna ports 207 and 208 and the antenna ports 209 and 210 may be switched and used based on a predetermined condition. This predetermined condition is determined based on a value given or reported by the base station, a value such as an RNTI set in a terminal and / or a value such as a base station-specific physical cell ID.

The number of SCCEs used for a single SPDCCH depends on the SPDCCH format and is based on other parameters. The number of SCCEs used for one SPDCCH is also referred to as the aggregation level. For example, the number of SCCEs used for one SPDCCH is determined based on the number of resource units that can be used to transmit the SPDCCH in one pair of RBs, the transmission method of the SPDCCH, the TTI length, and / or the like. For example, the number of SCCEs used for one SPDCCH is 1, 2, 4, 8, 16, or 32. Further, the number of SREGs used for one SCCE is determined based on the TTI length, subframe type, and / or type. cyclic prefix. For example, the number of SREGs used for one SCCE is 2, 4, or 8. As the transmission method of the SPDCCH, distributed transmissions or localized transmissions can be supported.

Distributed transmissions or localized transmissions can be used to transmit the SPDCCH. Such distributed transmissions and localized transmissions differ in how the SCCE is mapped to an SREG and a pair of RBs. For example, in the case of distributed transmissions, one SCCE is configured using SREGs of multiple RB pairs. In the case of localized transmission, one SCCE is configured using an SREG of one pair of RBs.

In the SPDCCH, the configuration of the SREG may not be defined, so only the configuration of the SCCE can be determined. In this case, only localized transmissions can be supported on the SPDCCH.

Base station 1 tunes with respect to SPDCCH in terminal 2. Terminal 2 monitors a predetermined number of SPDCCH candidates based on tuning from base station 1. A set of RB pairs in which terminal 2 monitors SPDCCH can be defined here. This set of RB pairs is also referred to as the SPDCCH set or the SPDCCH-PRB set. One terminal 2 may have one or more SPDCCH channel sets specified. Each SPDCCH set contains one or more pairs of RBs. Further, tuning with respect to the SPDCCH can be done individually for each set of SPDCCHs.

Base station 1 may preset a predetermined number of SPDCCH sets in terminal 2. For example, up to two SPDCCH sets can be set as SPDCCH set 0 and / or SPDCCH set 1. Each of the SPDCCH sets may be composed of a predetermined number of RB pairs. Each set of SPDCCH channels constitutes one set of SCCE channels. The set of SCCEs configured in one set of SPDCCHs is determined based on the length of the TTI, the number of RB pairs specified as the set of SPDCCHs, and / or the number of SREGs used in one SCCE. If the number of SCCEs configured in one SPDCCH set is N, each SPDCCH set contains SCCEs numbered 0 through N-1. For example, if the number of SREGs used in one SCCE is 4, the SPDCCH set is formed by 4 pairs of RBs constituting 16 SCCEs.

FIG. 12 is a diagram illustrating a configuration example of a shortened control channel element (SCCE) according to an embodiment of the present invention. In the example shown in FIG. 12, the number of SREGs constituting one SCCE is 2, which is suitable for the configuration of the SCCE in a case where the TTI is 2. As shown in FIG. 12, resources indicated by a dashed line indicate one SCCE. In the case where the TTI length is 2, the SPDCCH in which the aggregation level is 2 corresponds to two SCCEs in the SPDCCH set in the same TTI.

On SPDCCH, a start symbol for a subframe may be specified. This start symbol indicates the symbol from which to start the mapping of resource elements on the SPDCCH in a certain subframe. For example, when the start symbol is 3 in a subframe, the SPDCCH can be mapped from symbol 3 in slot 0 to the last symbol in the subframe. For example, the symbol before the start symbol can be used as an area used for transmitting the PDCCH.

Further, in the example shown in FIG. 12, in the case where the start symbol is 3, the number of resource elements in the SCCE formed by SREGs 2 and 3 is reduced by half as compared to other SCCEs. Therefore, you can use a wide variety of ways to work with such an SCCE. Such an SCCE may be determined based on the number of resource elements available for transmission of the SPDCCH in the SCCE. For example, it is determined whether an SCCE is the one to work with based on whether the number of available resource elements is greater or less than a specified number. This predetermined number may be set or specified in advance by means of RRC control signaling.

As an example of such a method of operation, an SCCE in which the number of available resource elements is less than a predetermined number is not used to transmit the SPDCCH. In other words, in a TTI containing such an SCCE, since the SPDCCH is not transmitted, the terminal does not monitor this SPDCCH.

As another example of such a way of operating, in a TTI containing an SCCE in which the number of available resource elements is less than a predetermined number, the number of SREGs that make up one SCCE, a combination of aggregation levels, or the like is different from other TTIs. For example, a TTI containing such an SCCE has a higher aggregation level than other TTIs.

In the case where a start symbol is specified in the SPDCCH set, the configuration of the SCCE can be determined based on this start symbol. For example, an SCCE element can be arranged in order starting from this start character.

The resource element mapping portion of the SPDCCH and the demodulation reference signal associated with this SPDCCH described in this embodiment can be reformulated as follows.

The terminal in communication with the base station comprises a high-level processor module performing one or more SPDCCH settings using higher-level signaling from the base station, and a receiving module monitoring the SPDCCH channel transmitted based on an extended subframe of fewer symbols. than the number of symbols corresponding to a normal subframe and a resource block specified by SPDCCH tuning. The SPDCCH is transmitted using one or more control channel elements. Such a control channel element is composed of several groups of resource elements. The resource element group is specified in association with a symbol from the resource block pair in each of the resource block pairs specified by the SPDCCH settings.

The number of resource element groups that make up each resource block pair is equal to the number of characters in that pair of resource blocks.

The demodulation reference signal associated with the SPDCCH is mapped to all resource elements included in a given subcarrier in each resource block pair specified by the SPDCCH settings.

The demodulation reference signal associated with the SPDCCH is mapped to resource units in two consecutive symbols corresponding to a group of resource units used to map the SPDCCH to each of the pairs of resource blocks specified by the SPDCCH settings.

The SPDCCH tuning contains information indicating the number of symbols in the extended subframe. The number of control channel elements used to transmit the SPDCCH is determined based on at least the number of symbols in the extended subframe. The number of resource element groups constituting the control channel element is determined based on at least the number of symbols in the extended subframe. The configuration of the group of resource elements in each of the pairs of resource blocks is used throughout, regardless of the number of symbols in the extended subframe.

The base station in communication with the terminal comprises a high-level processor module performing one or more SPDCCH settings via higher-layer signaling from the terminal, and a transmitting module transmitting the SPDCCH channel transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by setting the SPDCCH. The SPDCCH is transmitted using one or more control channel elements. Such a control channel element is composed of several groups of resource elements. The group of resource elements is specified in association with a symbol in a pair of resource blocks within each of the pairs of resource blocks specified by the SPDCCH setting.

A method for transmitting a HARQ-ACK in response to receiving an SPDSCH according to the embodiment under consideration

The terminal transmits a HARQ-ACK in response to the scheduled SPDSCH. Various methods can be used to transmit the HARQ-ACK in response to the SPDSCH.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, a terminal may transmit a HARQ-ACK in response to an SPDSCH on a SPUCCH or SPUSCH at a predetermined TTI. For example, the terminal transmits a HARQ-ACK in response to the SPDSCH received in a TTI on the SPUCCH or SPUSCH after four TTIs from the specified reception TTI.

FIG. 13 is a diagram illustrating an example of transmitting an HARQ-ACK in response to an SPDSCH and an HARQ-ACK in response to a PDSCH. This fig. 13 illustrates an example in which a TTI for transmitting a HARQ-ACK in response to an SPDSCH is included in a subframe for transmitting an HARQ-ACK in response to a PDSCH. In this case, it is necessary for the terminal to simultaneously transmit the HARQ-ACK in response to the SPDSCH and the HARQ-ACK in response to the PDSCH, however, since the terminal supporting transmission on only one carrier is unable to transmit these two acknowledgments simultaneously, it may be necessary special procedure. Various methods can be used to accomplish this procedure.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, in a case where a TTI for transmitting an HARQ-ACK in response to an SPDSCH is included in a subframe for transmitting an HARQ-ACK in response to a PDSCH, the terminal does not transmits (discards) the HARQ-ACK in response to the PDSCH. In other words, the terminal preferably transmits the HARQ-ACK in response to the SPDSCH.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, in a case where a TTI for transmitting an HARQ-ACK in response to an SPDSCH is included in a subframe for transmitting an HARQ-ACK in response to a PDSCH, the terminal does not transmits (discards) the HARQ-ACK in response to the SPDSCH. In other words, the terminal preferably transmits the HARQ-ACK in response to the PDSCH.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, in a case where a TTI for transmitting an HARQ-ACK in response to an SPDSCH is included in a subframe for transmitting an HARQ-ACK in response to a PDSCH, the terminal transmits a HARQ-ACK in response to the PDSCH on the SPUCCH or on the SPUSCH to transmit the HARQ-ACK. In other words, a HARQ-ACK in response to the PDSCH is superimposed on the SPUCCH or SPUSCH to transmit this HARQ-ACK in response to the SPDSCH.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, in a case where a TTI for transmitting an HARQ-ACK in response to an SPDSCH is included in a subframe for transmitting an HARQ-ACK in response to a PDSCH, the terminal transmits HARQ-ACK in response to SPDSCH over PUCCH or PUSCH to transmit the HARQ-ACK. In other words, the HARQ-ACK in response to the SPDSCH is superimposed on the PUCCH or PUSCH to transmit the HARQ-ACK in response to the PDSCH.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, a terminal assumes that a PDSCH in which a HARQ-ACK is transmitted in response to a PDSCH is not scheduled in a subframe containing a TTI for transmitting an HARQ-ACK in response to channel SPDSCH. In other words, in a certain subframe, the SPDSCH and the PDSCH are scheduled so that the HARQ-ACK in response to the SPDSCH and the HARQ-ACK in response to the PDSCH are not transmitted at the same time.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, a terminal assumes that an SPDSCH in which the HARQ-ACK is transmitted in response to an SPDSCH is not scheduled in all or part of the TTI for transmitting the HARQ-ACK. in response to the SPDSCH and is included in the subframe. In other words, in a certain subframe, the SPDSCH and the PDSCH are scheduled so that the HARQ-ACK in response to the SPDSCH and the HARQ-ACK in response to the PDSCH are not transmitted at the same time.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, in a case where a TTI for transmitting an HARQ-ACK in response to an SPDSCH is included in a subframe for transmitting an HARQ-ACK in response to a PDSCH, the terminal transmits the HARQ-ACK in response to the SPDSCH and the HARQ-ACK in response to the PDSCH individually. This terminal is capable of transmitting SPUCCH or SPUSCH and PUCCH or PUSCH at the same time.

As an example of a method for transmitting a HARQ-ACK in response to an SPDSCH, in a case where a TTI for transmitting an HARQ-ACK in response to an SPDSCH is included in a subframe for transmitting an HARQ-ACK in response to a PDSCH, the terminal transmits the HARQ-ACK in response to the SPDSCH and the HARQ-ACK in response to the PDSCH are individual, however, the PUCCH or PUSCH for transmitting the HARQ-ACK in response to the PDSCH is transmitted after puncturing or negotiating data rates on the resource element, included in the TTI in which the HARQ-ACK is transmitted in response to the SPDSCH.

Further, in the above description, the method for transmitting HARQ-ACK in response to the SPDSCH has been described in connection with the TTI for transmitting the HARQ-ACK in response to the SPDSCH included in the subframe for transmitting the HARQ-ACK in response to the PDSCH, however, the present invention is not limited to this. This method of transmitting the HARQ-ACK in response to the SPDSCH can also be applied in a case in which the TTI for transmitting the HARQ-ACK in response to the SPDSCH is included in a subframe for transmitting the PUSCH.

SPUSCH channel transmission method according to the considered variant

The terminal transmits the SPUSCH channel scheduled on the SPDCCH channel. Various methods can be used to transmit the SPUSCH channel.

As an example of the SPUSCH transmission method, the terminal may transmit the SPUSCH in a predetermined TTI. For example, the terminal transmits a SPUSCH scheduled in a TTI in the fourth TTI, counting from the TTI in which the scheduling is performed.

As an example of a SPUSCH transmission method, in a case where a TTI for transmitting a SPUSCH is included in a subframe for transmitting a HARQ-ACK in response to a PDSCH, the terminal does not transmit (discard) a HARQ-ACK in response to a PDSCH ... In other words, the terminal preferably transmits the SPUSCH channel.

As an example of a SPUSCH transmission method, in a case where a TTI for SPUSCH transmission is included in a subframe for transmitting a HARQ-ACK in response to a PDSCH, the terminal does not transmit (drops) the SPUSCH. In other words, the terminal preferably transmits the HARQ-ACK in response to the PDSCH.

As an example of a SPUSCH transmission method, in a case where a TTI for SPUSCH transmission is included in a subframe for transmitting a HARQ-ACK in response to a PDSCH, a terminal transmits a HARQ-ACK in response to a PDSCH on a SPUSCH. In other words, the HARQ-ACK in response to the PDSCH is superimposed on the SPUSCH.

As an example of a SPUSCH transmission method, in a case where a TTI for transmitting a SPUSCH is included in a subframe for transmitting a HARQ-ACK in response to a PDSCH, the terminal transmits a SPUSCH codeword (transport block) on a PUCCH or PUSCH to transmit a HARQ-ACK in response to the PDSCH. In other words, the codeword (transport block) of the SPUSCH is superimposed on the PUCCH or the PUSCH to transmit the HARQ-ACK in response to the PDSCH.

As an example of the SPUSCH transmission method, the terminal assumes that the PDSCH that transmits the HARQ-ACK in response to the PDSCH is not scheduled in a subframe containing a TTI for SPUSCH transmission. In other words, in some subframe, the SPDSCH and the PDSCH are scheduled so that the SPUSCH and the HARQ-ACK in response to the PDSCH are not transmitted at the same time.

As an example of the SPUSCH transmission method, the terminal assumes that the SPDSCH in which the HARQ-ACK is transmitted in response to the SPUSCH is not scheduled in all or part of the TTI for the SPUSCH transmission and is included in the corresponding subframe. In other words, in some subframe, the SPDUCH and the PDSCH are scheduled such that the SPUSCH and the HARQ-ACK in response to the PDSCH are not transmitted at the same time.

As an example of a SPUSCH transmission method, in a case where a TTI for transmitting a SPUSCH is included in a subframe for transmitting a HARQ-ACK in response to a PDSCH, the terminal transmits a SPUSCH and a HARQ-ACK in response to a PDSCH individually. The terminal is capable of transmitting SPUCCH or SPUSCH and PUCCH or PUSCH at the same time.

As an example of a SPUSCH transmission method, in a case where a TTI for SPUSCH transmission is included in a subframe for transmitting a HARQ-ACK in response to a PDSCH, the terminal transmits a SPUSCH and a HARQ-ACK in response to a PDSCH individually, however, the PUCCH or PUSCH for transmitting the HARQ-ACK channel in response to the PDSCH is transmitted after puncturing or rate matching performed on the resource element in the TTI in which the SPUSCH is transmitted.

Further, in the above description, the SPUSCH transmission method has been described in connection with the TTI for SPUSCH transmission included in the subframe for transmission of the HARQ-ACK in response to the PDSCH, but the present invention is not limited to this. This SPUSCH transmission method can also be applied in a case where a TTI for SPUSCH transmission is included in a subframe for PUSCH transmission.

The part of the procedure for transmitting the HARQ-ACK and transmitting the SPUSCH channel of the SPDSCH described in this embodiment can be reformulated as follows.

The terminal in communication with the base station comprises a receiving module receiving a first PDSCH transmitted based on a subframe determined by a predetermined number of symbols and a second PDSCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe. and a transmitting unit transmitting a first HARQ-ACK, which is feedback in response to receiving the first PDSCH, and a second HARQ-ACK, which is feedback, in response to receiving the second PDSCH, after the predetermined extended subframe.

The first HARQ-ACK is transmitted on the first PUCCH or the first PUSCH in a subframe a predetermined number of subframes after the subframe in which the first PDSCH was received. The second HARQ-ACK is transmitted on the second PUCCH or the second PUSCH in an extended subframe a predetermined number of subframes after the subframe in which the second PDSCH was received.

The second HARQ-ACK is not transmitted in an extended subframe included in the subframe for transmitting the first HARQ-ACK.

The receiving unit of the terminal assumes that the second HARQ-ACK, which may be transmitted in an extended subframe included in the subframe for transmitting the first HARQ-ACK, has not been received.

The transmitting unit of the terminal discards the second HARQ-ACK in the event that this second HARQ-ACK transmitted in an extended subframe included in the subframe for transmitting the first HARQ-ACK occurs.

The transmitting unit of the terminal transmits the second HARQ-ACK on the first PUCCH or the first PUSCH for transmitting the first HARQ-ACK in the case in which the second HARQ-ACK has occurred, transmitted in an extended subframe included in the subframe for transmitting the first HARQ -ACK.

The first HARQ-ACK is not transmitted in a subframe containing an extended subframe for transmitting the second HARQ-ACK.

The receiving unit of the terminal assumes that the first HARQ-ACK, which may be transmitted in a subframe containing an extended subframe for transmitting the second HARQ-ACK, has not been received.

The transmitting unit of the terminal discards the first HARQ-ACK in a case where the first HARQ-ACK transmitted in a subframe containing an extended subframe for transmitting the second HARQ-ACK appears.

In the case where the first HARQ-ACK transmitted in a subframe containing an extended subframe for transmitting the second HARQ-ACK occurs, the terminal's transmitting unit transmits this first HARQ-ACK on the second PUCCH channel or the second PUSCH channel to transmit the second HARQ- ACK.

The receiving unit of the terminal receives the first PDCCH to report the allocation information of the first PUSCH transmitted based on the specified subframe. The transmitting unit of the terminal transmits the first PUSCH channel based on the indicated allocation information. The second HARQ-ACK is not transmitted in the extended subframe included in the subframe for transmitting the first PUSCH.

The receiving unit of the terminal receives the first PDCCH to report the allocation information of the first PUSCH transmitted based on the specified subframe. The transmitting unit of the terminal transmits the first PUSCH channel based on the allocation information. The first PUSCH is not transmitted in a subframe containing an extended subframe for transmitting the second HARQ-ACK.

The receiving unit of the terminal receives the second PDCCH, reporting allocation information of the second PUSCH transmitted based on the extended subframe. The transmitting unit of the terminal transmits the second PUSCH channel based on this allocation information. The second PUSCH is not transmitted in an extended subframe included in the subframe for transmitting the first HARQ-ACK.

The receiving unit of the terminal receives the second PDCCH for reporting the allocation information of the second PUSCH transmitted based on the extended subframe. The transmitting unit of the terminal transmits the second PUSCH channel based on this allocation information. The first HARQ-ACK is not transmitted in a subframe containing an extended subframe for transmitting the second PUSCH.

The base station communicating with the terminal comprises a transmitting unit that transmits a first PDSCH transmitted based on a subframe determined by a predetermined number of symbols and a second PDSCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe. and a receiving unit that receives a first HARQ-ACK, which is feedback in response to receiving the first PDSCH, and a second HARQ-ACK, which is feedback in response to receiving the second PDSCH, after a predetermined extended subframe.

A method for displaying resource elements of the SPDCCH and / or SPDSCH according to the embodiment under consideration

As described above, the STTI is mapped based on the resource sub-block. In other words, the SPDCCH and / or the SPDSCH are mapped based on the resource sub-block. The mapping of SPDCCH and / or SPDSCH resource elements described in this embodiment is also applicable to the SPDCCH and / or SPDSCH candidate to be monitored.

According to the present embodiment, in the case when a given channel or signal is not mapped to a given resource element, a given method can be used for mapping. An example of this predetermined method is data rate negotiation. In the process of negotiating data rates, a given channel or signal is displayed, while passing a given resource element. It is necessary for the terminal to recognize or assume that data rate matching is used to map to a given resource element when receiving (demodulating and decoding) a given channel or signal. Another example of a predetermined method is the so-called gouging. When using gouging, it is assumed that the specified channel will be displayed without skipping the specified resource element, but another channel or signal will be mapped (overwritten) to the specified resource element. Preferably, the terminal recognizes or assumes that puncturing is being used to map to a given resource element when receiving (demodulating, decoding) a given channel or signal, however, the terminal may not make such a recognition or guess. In this case, the reception accuracy is degraded, however, the terminal can still receive by adjusting the code rate or the like. In the description of the option under consideration, both methods - matching the data rate, puncturing, can be used as a way to display resource elements.

The SPDCCH and / or SPDSCH are mapped to a resource element based on various conditions, criteria, or scales. In other words, in each of the antenna ports used to transmit the SPDCCH and / or the SPDSCH, a block of symbols with complex values is mapped to a resource element satisfying a given condition, criterion, or scale in the (current) target TTI. This specified condition, criterion or scale is, at least in part, the following conditions, criteria or scale. The conditions, criteria or scales used to map the SPDCCH and / or the SPDSCH (second PDSCH) to the resource element are also referred to as second condition, second criterion, or second scale, respectively. The conditions, criteria, or scales used to map the PDSCH (first PDSCH) to the resource element are also referred to as first condition, first criterion, or first measure, respectively.

(1) The resource unit to which the SPDCCH and / or the SPDSCH is mapped is in a resource sub-block allocated for transmission. Further, the resource element to which the PDSCH is mapped is in the resource block allocated for transmission.

(2) The resource element to which the SPDCCH and / or the SPDSCH are mapped is not used for channel and clock transmission. Further, the resource element to which the PDSCH is mapped is not used for transmitting the PBCH and clock.

(3) The resource unit to which the SPDCCH and / or the SPDSCH are mapped is assumed not to be used by the terminal for the CRS signal. Further, the resource element to which the PDSCH is mapped is not supposedly used by the terminal for the CRS signal. The terminal assumes that the CRS signal may be different on the SPDCCH and / or SPDSCH and the PDSCH. For example, the CRS signal assumed in the mapping of the SPDCCH and / or the SPDSCH is set regardless of the CRS signal assumed in the mapping of the SPDCCH and / or the SPDSCH.

(4) In a resource subunit that does not transmit the DMRS signal associated with the SPDCCH and / or the SPDSCH, the SPDCCH and / or the SPDSCH are transmitted through the antenna port through which the CRS signal is transmitted, or through the antenna port through which transmitting the DMRS signal associated with the SPDCCH and / or the SPDSCH. The DMRS signal associated with the SPDCCH and / or the SPDSCH may be a DMRS signal mapped to a resource block containing a resource sub-block to which the SPDCCH and / or SPDSCH are mapped. Further, in the resource subunit in which the DMRS signal associated with the PDSCH is not transmitted, the PDSCH is transmitted through the antenna port to which the antenna port is associated, through which the CRS signal is transmitted. The antenna port through which the SPDCCH and / or the SPDSCH is transmitted may be the same or different from the antenna port through which the PDSCH is transmitted.

(5) In the resource subunit in which the DMRS signal associated with the SPDCCH is transmitted, the SPDCCH and / or the SPDSCH are transmitted through the antenna port through which the CRS signal is transmitted, or through the antenna port through which the DMRS signal associated with channel SPDCCH and / or channel SPDSCH. The DMRS signal associated with the SPDCCH and / or SPDSCH may be a DMRS signal mapped to a resource block containing a resource sub-block to which the DMRS signal and / or SPDCCH and / or SPDSCH are mapped. Further, in the resource subunit in which the DMRS signal associated with the PDSCH is transmitted, the PDSCH is transmitted through the antenna port through which the DMRS signal associated with the PDSCH is transmitted. The antenna port through which the SPDCCH and / or the SPDSCH is transmitted may be the same or different from the antenna port through which the PDSCH is transmitted. In other words, the antenna port through which the DMRS signal associated with the SPDCCH and / or the SPDSCH is transmitted is the same or different from the antenna port through which the DMRS signal associated with the PDSCH is transmitted.

(6) In the case where the SPDCCH and / or the SPDSCH are transmitted in a subframe of the MBSFN signal, the SPDCCH and / or the SPDSCH are transmitted through the antenna port through which the DMRS signal associated with the SPDCCH and / or the SPDSCH is transmitted. The DMRS signal associated with the SPDCCH and / or the SPDSCH may be a DMRS signal mapped to a resource block containing a resource sub-block to which the SPDCCH and / or SPDSCH are mapped. The MBSFN signal subframe is defined in a cell-specific manner or in a terminal-specific manner through RRC control signaling. Further, in the case where the PDSCH is transmitted in the subframe of the MBSFN signal, the PDSCH is transmitted through the antenna port through which the DMRS signal associated with the PDSCH is transmitted. The antenna port through which the SPDCCH and / or the SPDSCH is transmitted may be the same or different from the antenna port through which the PDSCH is transmitted. In other words, the antenna port through which the DMRS signal associated with the SPDCCH and / or the SPDSCH is transmitted may be the same or different from the antenna port through which the DMRS signal associated with the PDSCH is transmitted.

(7) SPDCCH and / or SPDSCH are not mapped to resource units used for the DMRS signal associated with the SPDCCH and / or SPDSCH. Further, the PDSCH is not mapped to resource elements used for the DMRS signal associated with the PDSCH. The DMRS signal associated with the SPDCCH and / or the SPDSCH may be the same or different from the DMRS signal associated with the PDSCH. Further, the SPDCCH and / or the SPDSCH may not be mapped to the resource element used for the DMRS signal, further associated with the PDSCH.

(8) The SPDCCH and / or the SPDSCH are not mapped to resource units used for the ZP CSI-RS signal and / or the NZP CSI-RS signal specified in a cell-specific manner or in a terminal-specific manner. Further, the PDSCH is not mapped to resource elements used for the ZP CSI-RS signal and / or the NZP CSI-RS signal specified in a cell-specific manner or in a terminal-specific manner. The ZP CSI-RS signal and / or the NZP CSI-RS signal when mapping the SPDCCH channel and / or the SPDSCH channel may have the same settings as the ZP CSI-RS signal and / or the NZP CSI-RS signal when mapping the PDSCH channel.

(9) The SPDCCH and / or SPDSCH are not mapped to a pair of resource blocks, a resource subblock, an extended resource element group, or a resource element for transmitting an EPDCCH associated with an SPDCCH and / or an SPDSCH. For example, the SPDCCH and / or the SPDSCH are not mapped to a resource sub-block containing a resource element to which the EPDCCH associated with the SPDCCH and / or the SPDSCH is mapped. Further, the PDSCH is not mapped to a pair of resource blocks for transmitting the EPDCCH associated with the PDSCH.

(10) SPDCCH and / or SPDSCH are mapped to the symbol after the symbol indicated by the specified index in the first slot in some subframe (start symbol of SPDCCH and / or SPDSCH). In other words, in the case where the resource sub-block to which the SPDCCH and / or the SPDSCH are to be mapped contains a symbol before the start symbol of the SPDCCH and / or the SPDSCH in some sub-frame, the SPDCCH and / or SPDSCH are not mapped to this symbol. The predetermined index indicating the start symbol of the SPDCCH and / or the SPDSCH is set in a cell-specific manner or in a terminal-specific manner. For example, a predetermined index indicating a start symbol of the SPDCCH and / or the SPDSCH is input to the downlink STTI option setting and is set. The minimum value of the specified index indicating the start symbol of the SPDCCH channel and / or the SPDSCH channel may be set to 0. Further, the start symbols of the SPDCCH channel and / or the SPDSCH channel may be specified in advance without being specified and may be set equal to, for example, 0. Others in words, the SPDCCH and / or the SPDSCH can be mapped to all symbols in a subframe.

Next, the PDSCH is mapped to a symbol after the symbol indicated by the predetermined index in the first slot in a certain subframe (PDSCH start symbol). This specified index indicating the start symbol of the SPDCCH and / or the SPDSCH may be the same or different from the specified index indicating the start symbol of the PDSCH. The minimum value of the predetermined index indicating the start symbol in the PDSCH is 1.

(11) The SPDCCH and / or the SPDSCH are not mapped to resource units in the resource unit group allocated on the PCFICH or PHICH. Further, the PDSCH is not mapped to a symbol containing the resource element group allocated to the PCFICH or PHICH (in other words, the first symbol in some subframe). In other words, the SPDCCH and / or the SPDSCH can be mapped to resource units other than the resource unit group in the symbol containing the resource unit group allocated to the PCFICH or PHICH. In order to map the resource elements of the SPDCCH and / or the SPDSCH, data rates are preferably negotiated in the resource element used to transmit the PCFICH or PHICH.

(12) The SPDCCH and / or the SPDSCH are not mapped to a pair of resource blocks, a resource sub-block, a symbol, a TTI, a group of resource elements, or a resource element for transmitting a PDCCH associated with an SPDCCH or an SPDSCH. In other words, the SPDCCH and / or the SPDSCH are not mapped to a pair of resource blocks containing a resource element or resource group, resource subblock, symbol, TTI, or resource element group for transmitting the PDCCH associated with the SPDCCH and / or SPDSCH. ...

Further, the PDSCH is mapped regardless of transmission of all PDCCHs, including the PDCCH associated with the PDSCH. For example, the PDCCH is transmitted in the symbol indicated by the CFI set or reported by the base station, and the PDSCH is not mapped to the symbol used to transmit the PDCCH. Therefore, when mapping the PDSCH, the terminal does not need to recognize or assume the resource element used to transmit the PDCCH.

On the other hand, in the case where the SPDCCH and / or the SPDSCH are also mapped to a symbol containing the resource element used for transmitting the PDCCH, it is preferable that the terminal recognizes or guesses the resource element used for transmitting the PDCCH when mapping the PDSCH ... When mapping the SPDCCH and / or SPDSCH resource elements, puncturing is preferably performed on the resource element used to transmit the PDCCH. Further, when mapping SPDCCH and / or SPDSCH resource elements, the term PDCCH includes not only the PDCCH associated with the SPDCCH and / or SPDSCH, but also some or all of the PDCCHs that the terminal in question can recognize or receive.

(13-1) The SPDCCH and / or the SPDSCH are not mapped to resource units, a pair of resource blocks, or a group of resource blocks used to transmit a PDSCH scheduled for a (recognized or received) terminal. For example, in a case where a certain PDSCH is scheduled for a certain terminal, the terminal assumes that the SPDCCH and / or the SPDSCH are not mapped to a resource block used to transmit the PDSCH or a resource sub-block in a group of resource blocks. Further, in this case, the SPDCCH and / or the SPDSCH may be mapped to a symbol (PDCCH area) before the PDSCH start symbol in a resource block or resource block group.

In the case in which the SPDCCH and / or the SPDSCH are not mapped to a resource block, a pair of resource blocks, or a group of resource blocks used to transmit a PDSCH scheduled for a terminal, the PDSCH can be mapped independently of the mapping of the SPDCCH and / or SPDSCH. In other words, in the case where the PDSCH is scheduled for resources including some resource block, the SPDCCH and / or the SPDSCH containing the resource sub-block in this resource block is not mapped. In other words, the terminal assumes that the SPDCCH and / or the SPDSCH using the resource sub-block in the resource block used to transmit the PDSCH scheduled for that terminal is not displayed (transmitted). The terminal may not monitor candidate channels for SPDCCH and / or SPDSCH.

In other words, in the case where the candidate SPDCCH and / or SPDSCH and the PDSCH to be scheduled collide in the same resource element, resource block, or resource sub-block, the PDSCH is preferably mapped and the SPDCCH and / or SPDSCH channel is not displayed.

(13-2) The SPDCCH and / or the SPDSCH are mapped regardless of the transmission of the PDSCH scheduled (recognized or received) for the terminal. For example, even when a certain PDSCH is scheduled for a terminal, the terminal assumes that the SPDCCH and / or the SPDSCH can be mapped to a resource block used to transmit the PDSCH or a resource sub-block in a resource block group. In other words, the terminal monitors the candidate SPDCCH and / or SPDSCH to be set regardless of the scheduling of the PDSCH.

In the case where the SPDCCH and / or the SPDSCH are mapped regardless of the transmission of the PDSCH scheduled for the terminal, the mapping of the PDSCH depends on the mapping of the SPDCCH and / or the SPDSCH. For example, the PDSCH is not mapped to resource elements corresponding to candidate channels for all SPDCCHs and / or SPDSCHs. For example, the PDSCH is not mapped to a resource element corresponding to the SPDCCH and / or the SPDSCH that is received from the plurality of candidate channels for the SPDCCH and / or SPDSCH. In other words, the PDSCH is also mapped to resource units corresponding to SPDCCHs and / or SPDSCHs that are not received in the plurality of candidate channels for SPDCCH and / or SPDSCH.

Further, the PDSCH may not be scheduled in resource blocks or sub-frames containing resource sub-blocks used for transmission of the SPDCCH and / or the SPDSCH. For example, the terminal assumes that the PDSCH is not scheduled in a resource block or sub-frame containing a resource sub-block corresponding to a candidate SPDCCH and / or SPDSCH.

In other words, in the case where the candidate SPDCCH and / or SPDSCH and the PDSCH to be scheduled collide in the same resource element, resource block, or resource sub-block, the SPDCCH and SPDSCH are preferably mapped and the PDSCH is mapped. to a resource element other than the resource element to which the SPDCCH and / or the SPDSCH are mapped.

(13-3) The mapping of resource elements described in paragraphs (13-1) and (13-2) is switched based on a predetermined condition and used. For example, in the case where the PDSCH is scheduled through the EPDCCH, the resource element mapping described in paragraph (13-1) is used, and in the case where the PDSCH is scheduled through the PDCCH, the resource element mapping described in paragraph (13- 2). For example, in the case where the PDSCH is scheduled through the EPDCCH, the resource element mapping described in paragraph (13-2) is used, and in the case where the PDSCH is scheduled through the PDCCH, the resource element mapping described in paragraph (13- 1).

FIG. 14 is a diagram illustrating a mapping example of SPDCCH and / or SPDSCH resource elements. FIG. 14 illustrates the resource elements of two pairs of resource blocks on the downlink. Resource elements R0 through R3 are resource elements to which the CRS signal is mapped accordingly. Resource elements C1 through C4 are resource elements to which the CSI-RS signal is mapped. The CFI resource element is a resource element to which the PCFICH is mapped. The HI resource element is a resource element to which the PHICH is mapped.

In the example shown in FIG. 14, the TTI is 1 symbol. In other words, one resource sub-block is formed by one symbol and 12 resource elements, indicated by 12 sub-carriers. The terminal receives or monitors SPDCCH and / or SPDSCH mapped to a set of resource subblocks (resource blocks 0 and 1) in symbol 0 of slot 0, symbol 5 of slot 0 and symbol 3 of slot 1 based on the specified setting. The SPDCCH and / or SPDSCH in symbol 0 of slot 0 are mapped to resource elements other than resource elements used to transmit the CRS signal, the PCFICH, and the PHICH. The SPDCCH and / or SPDSCH in symbol 5 of slot 0 are mapped to all resource elements. The SPDCCH and / or SPDSCH in symbol 3 of slot 1 are mapped to a resource element other than the resource element used to transmit the CSI-RS signal.

The SPDCCH and / or SPDSCH can be further mapped after the start symbol of the SPDCCH and / or SPDSCH in some subframe. For example, in the case where the start symbol of SPDCCH and / or SPDSCH is symbol 3, the SPDCCH and / or SPDSCH can be mapped from symbol 3 of slot 0 to symbol 6 of slot 1. In the example shown in FIG. 14, the terminal does not intend to transmit or map the SPDCCH and / or SPDSCH to symbol 0 of slot 0. Therefore, the terminal may not receive or monitor the SPDCCH and / or SPDSCH in symbol 0 of slot 0.

Further, in the above description, an example has been considered in which the TTI size is specified based on the number of symbols, where a given symbol is used as a unit of symbol length, but the present invention is not limited to this example. The size of the TTI can be specified in a variety of ways or in different units. In this embodiment, the size of the TTI can be a duration of a certain period of time. For example, in another version of the TTI size specification, the number of symbols constituting each TTI is constant and the lengths of the corresponding symbols are different. In particular, the base station can transmit a signal in which the sub-carrier spacing and symbol length are varied. In the case where the interval between subcarriers is increased by “e” times, the symbol length is increased by 1 / e times. Further, the base station can multiplex signals with different symbol lengths in a single component carrier signal and transmit the multiplexed signal. In other words, since signals with different TTI lengths can be transmitted on a single component carrier, the method described above can be applied in a similar manner.

In accordance with the details of the above embodiment, it is possible to improve signal transmission efficiency in a radio communication system in which base station 1 and terminal 2 communicate with each other.

Application examples

Application examples for base station

First application example

FIG. 15 is a block diagram illustrating a first example of a simplified configuration of an eNB to which the technology of the present invention can be applied. The eNB 800 includes one or more antennas 810 and base station equipment 820. Each antenna 810 and base station equipment 820 may be connected to one another via a high frequency cable.

Each of the antennas 810 includes one or more antenna elements (eg, multiple antenna elements that make up an antenna for a MIMO system) and is used by base station equipment 820 to transmit and receive a radio signal. The eNB 800 may include multiple antennas 810, as shown in FIG. 15 so that these multiple antennas 810 may, for example, correspond to multiple frequency bands used by the eNB 800. It should be noted that although FIG. 15 shows an example where an eNB 800 includes multiple antennas 810, that eNB 800 may have a single antenna 810.

Base station hardware 820 includes a controller 821, a memory 822, a network interface 823, and a radio interface 825.

Controller 821 may be, for example, a central processing unit (CPU) or digital signal processor (DSP), and perform a variety of higher layer functions in base station hardware 820. For example, controller 821 generates a data packet based on signal data processed by radio interface 825 and transmits this generated data packet via network interface 823. Controller 821 can generate a combined data packet by combining data from multiple video range processors and transmit the combined packet it generated. Further, the controller 821 may also have a logical function to perform control such as radio resource control, radio bearer control, mobility control, connection control, and scheduling. Further, such control can be performed in conjunction with the surrounding eNB or with the backbone network node. The memory 822 contains random access memory (RAM) and read only memory (ROM), and stores a program executed by the controller 821 and various control data (such as, for example, a list of terminals, data on transmission power and planning data).

Network interface 823 is a communications interface for connecting base station equipment 820 to a communications core 824. The controller 821 may communicate with a core network node or another eNB via this network interface 823. In this case, the eNB 800 may be connected to a core network node or to another eNB via a logical interface (e.g., S1 interface or X2). The network interface 823 may be a wired communication interface or a radio communication interface for radio backhaul and communication with a network center. If the network interface 823 is a radio interface, the network interface 823 can use a higher frequency range for radio communications than the frequency range used by the radio interface 825.

The radio interface 825 supports a cellular communication system, such as a long term evolution (LTE) or LTE-Advanced, and communicates with a terminal located in a cell of the eNB 800 via an antenna 810. Such a radio interface 825 can typically include a base band (BB) processor 826, a high frequency (RF) circuit 827, and other similar components. The BB 826 processor can, for example, perform encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and other similar signal and data processing, as well as various data processing at each layer (e.g., L1 layer, medium access control (MAC) layer , radio link control (RLC) layer, and packet data downlink protocol (PDCP) layer). Such BB 826 may have some or all of the logic functions described above instead of controller 821. BB 826 may be a module containing a memory with a communication control program stored therein, a processor for executing the program, and associated circuitry, so that the functions of the BB 826 processor can be changed by updating the program Further, the module can be a cut-in type board or panel inserted into a slot of base station hardware 820, or an integrated circuit chip mounted on such a board or panel. At the same time, the RF circuit 827 may include a mixer, filter, amplifier, and the like, and transmit and receive a radio signal through the antenna 810.

The radio interface 825 may include multiple such BB processors 826, as shown in FIG. 15 so that the multiple BB 826 processors may, for example, correspond to multiple frequency bands corresponding to the eNB 800. Further, the radio interface 825 may also comprise multiple RF circuits 827, as shown in FIG. 15, so that these multiple high frequency circuits 827 may correspond to multiple antenna elements, for example. Note that FIG. 15 illustrates an example in which the radio interface 825 includes multiple BB processors 826 and multiple RF circuits 827, however, such radio interface 825 may comprise a single BB 826 processor or a single RF circuitry 827.

Second application example

FIG. 16 is a block diagram illustrating a second example of a simplified configuration of an eNB to which the technology of the present invention can be applied. The eNB 830 includes one or more antennas 840, base station equipment 850, and a remote radio unit RRH 860. Each of the antennas 840 and the RRH unit 860 may be connected to one another via a high frequency cable. Further, the base station apparatus 850 and the RRH 860 can be connected to each other via a high speed communication link such as fiber optic cables.

Each of the antennas 840 contains one or more antenna elements (eg, multiple antenna elements that make up an antenna for a MIMO system) and is used by the RRH 860 to transmit and receive a radio signal. The eNB 830 may include multiple antennas 840, as shown in FIG. 16 so that the multiple antennas 840 may, for example, correspond to multiple frequency bands used by the eNB 830. Note that although FIG. 16 shows an example in which an eNB 830 contains multiple antennas 840, this eNB 840 may have a single antenna 840.

Base station hardware 850 includes controller 851, memory 852, network interface 853, radio interface 855, and communication interface 857. Controller 851, memory 852, and network interface 853 are similar to controller 821, memory 822, and network interface 823 described with reference to fig. 15.

The radio interface 855 supports a cellular communication system such as the LTE and LTE-Advanced system, and makes a radio connection to a terminal located in the sector corresponding to the RRH 860 through this RRH 860 and antenna 840. The radio interface 855 may typically contain a BB 856 processor or another similar component. The BB 856 is similar to the BB 826 described with reference to FIG. 15, except that this BB 856 is connected to the RF circuit 864 of the RRH 860 via a connecting interface 857. The radio interface 855 may comprise multiple BB 856 processors as shown in FIG. 16, so that these multiple BB 856 may, for example, correspond to multiple frequency bands used by the eNB 830. Note that FIG. 16 illustrates an example in which the radio interface 855 contains multiple BB 856 processors, however such radio interface 855 may contain a single BB 856.

Coupling interface 857 is an interface for connecting base station equipment 850 (radio interface 855) to an RRH 860. Coupling interface 857 may be a communication module for high-speed communication linking base station equipment 850 (radio interface 855) to an RRH unit 860.

Further, the RRH 860 includes a connection interface 861 and a radio interface 863.

The connection interface 861 is an interface for connecting the RRH 860 (radio interface 863) to the base station equipment 850. This connection interface 861 may be a communications module for communicating over said high speed line.

The radio interface 863 transmits and receives a radio signal through the antenna 840. This radio interface 863 may typically comprise RF circuitry 864 or other similar component. RF circuit 864 may include a mixer, filter, amplifier, and other similar components, and transmit and receive radio signal through antenna 840. Radio interface 863 may include multiple RF circuits 864, such that multiple RF circuits 864 may correspond to multiple antenna elements, for example. ... Note that FIG. 16 illustrates an example in which the radio interface 863 contains multiple high frequency circuits 864, however, such a radio interface 863 may comprise a single high frequency circuit 864.

The eNB 800, eNB 830, base station 820, or base station 850 shown in FIG. 15 and 16 may correspond to base station 1 described above with reference to FIG. 3 and other similar drawings.

Terminal application examples

First application example

FIG. 17 is a block diagram illustrating a simplified configuration example of a smartphone 900 as a terminal 2 to which the technology of the present invention can be applied. The smartphone 900 includes a processor 901, a random access memory 902, a mass storage device 903, an external connection interface 904, a video camera 906, a sensor 907, a microphone 908, an input device 909, a display 910, a loudspeaker 911, a radio interface 912, one or more antenna switches 915, one or more antennas 916, bus 917, battery 918, and auxiliary controller 919.

The processor 901 may be, for example, a CPU or system on chip (SoC), and controls functions at the application layer and other layers of the smartphone 900. Random access memory 902 contains RAM and ROM and stores programs executed by the processor 901 and data. The mass storage device 903 contains storage media such as semiconductor memories and hard disks. The external connection interface 904 is an interface for connecting the smartphone 900 to externally attached devices such as memory cards and universal serial bus (USB) devices.

The video camera 906 includes, for example, an imager such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) array. and generates a captured image. Sensor 907 may be a sensor array including, for example, a positioning sensor, a gyro sensor, a geomagnetic sensor, an acceleration sensor, and the like. Microphone 908 converts sound input to smartphone 900 into audio signal. The input device 909 includes, for example, a touch sensor that senses a touch on the display screen 910, a keypad, keyboard, button, switch, or other similar component, and receives input of an operation or information from a user. The display 910 comprises a screen, such a liquid crystal display (LCD) or organic light emitting diode (OLED), and presents the output of the smartphone 900. The loudspeaker 911 converts the audio signal from the smartphone 900 into sound.

The radio interface 912 supports a cellular communication system such as LTE or LTE-Advanced and implements radio communications. This radio interface 912 may typically comprise a BB processor 913, RF circuitry 914, and the like. The BB 913 may, for example, perform encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, as well as various types of signal processing for radio communications. Alternatively, RF circuitry 914 may include a mixer, filter, amplifier, and the like, and transmit and receive radio signals through antenna 916. Radio interface 912 may be a single chip module that integrates BB processor 913 and RF circuitry 914. This radio interface 912 may comprise multiple BB processors 913 and multiple RF circuits 914 as shown in FIG. 17. Note that FIG. 17 illustrates an example in which the radio interface 912 comprises multiple BB processors 913 and multiple high frequency circuits 914, however, such radio interface 912 may comprise a single BB 913 or a single high frequency circuit 914.

Further, the radio interface 912 can support other types of radio communication systems such as short-range radio communication system, near-field communication system, and wireless local area network (LAN) in addition to cellular communication systems, in which case interface 912 the radio may include its own BB 913 and RF circuitry 914 for each radio system.

Each antenna switch 915 switches the antenna connection for transmitting / receiving a signal between multiple circuits (eg, circuits for different radio communication systems) included in the radio interface 912.

Each of the antennas 916 includes one or more antenna elements (eg, multiple antenna elements constituting an antenna for a MIMO system) and is used for transmitting and receiving a radio signal by the radio interface 912. Smartphone 900 may include multiple antennas 916, as shown in FIG. 17. Note that FIG. 17 illustrates an example in which a smartphone 900 contains multiple antennas 916, but such a smartphone 900 may contain a single antenna 916.

Further, the smartphone 900 may include its own antenna 916 for each radio communication system. In this case, the antenna switch 915 can be excluded from the smartphone 900 configuration.

Bus 917 connects processor 901, random access memory 902, mass memory 903, external connection interface 904, video camera 906, sensor 907, microphone 908, input device 909, display 910, speaker 911, radio interface 912, and auxiliary controller 919 one s to others. Battery 918 provides electrical power to operate each unit of the smartphone 900 shown in FIG. 17 through a feeder line, which is partially shown in the drawing as a dashed line. The slave controller 919, for example, performs the minimum required functions of the smartphone 900 in sleep mode.

Second application example

FIG. 18 is a block diagram illustrating an example of a simplified configuration of an in-car navigation device 920 to which the technology of the present invention may be applied. This car navigator 920 includes a processor 921, a random access memory 922, a global positioning system (GPS) module 924, a sensor 925, a data interface 926, a content player 927, a media interface 928, an input device 929, a display 930, loudspeaker 931, radio interface 933, one or more antenna switches 936, one or more antennas 937, and battery 938.

The processor 921 may represent, for example, a CPU or SoC system, and controls the navigation function and other functions of the in-car navigation device 920. The memory 922 contains RAM and ROM and stores the program executed by the processor 921 and data.

The GPS module 924 uses the GPS signal received from the GPS satellite to measure the coordinates of the location (e.g., latitude, longitude, and altitude) of the car navigator 920. The sensor 925 may be a group of sensors containing, for example, a gyro sensor, a geomagnetic sensor, a barometric sensor and any other similar sensors. The data interface 926 is connected, for example, to the internal automotive network 941 via a terminal not shown and receives data such as vehicle speed data generated on the vehicle side.

The content player 927 reproduces content stored on a storage medium (eg, a CD or DVD) inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor that senses a touch on the display screen 930, a button, a switch, or the like and senses input of an operation or information from a user. The display 930 comprises a screen, such as a liquid crystal display (LCD) or an organic light emitting diode (OLED) display, and presents an image of a navigation function or playback content. Loudspeaker 931 emits sound corresponding to the navigation function or the content being played.

The radio interface 933 supports a cellular communication system, such as an LTE or LTE-Advanced system, and implements radio communication. This radio interface 933 may typically comprise a BB processor 934, RF circuitry 935, and the like. The BB 934 processor may, for example, perform encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, as well as various types of signal processing for radio communications. Alternatively, RF circuit 935 may include a mixer, filter, amplifier, and the like, and transmit and receive a radio signal through antenna 937. Radio interface 933 may be a single chip module that integrates BB processor 934 and RF circuit 935. This radio interface 933 may include multiple BB processors 934 and multiple RF circuits 935, as shown in FIG. 18. Note that FIG. 18 illustrates an example in which a radio interface 933 includes multiple BB processors 934 and multiple RF circuits 935, but such radio interface 933 may comprise a single BB 934 processor or a single RF circuitry 935.

Further, the radio interface 933 can support other types of radio communication systems, such as short-range radio communication system, near-field communication system, and radio local area network (LAN) in addition to cellular communication systems, in which case the radio communication interface 933 can contain its BB processor. 934 and RF circuit 935 for each radio communication system.

Each antenna switch 936 switches the antenna 937 connection between multiple circuits (eg, circuits for different radio communication systems) included in the radio interface 933.

Each of the antennas 937 includes one or more antenna elements (eg, multiple antenna elements constituting an antenna for a MIMO system) and is used for transmitting and receiving a radio signal by the radio interface 933. Car navigator 920 may include multiple antennas 937, as shown in FIG. 18. Note that FIG. 18 illustrates an example in which a car navigator 920 includes multiple antennas 937, but such a car navigator 920 may include a single antenna 937.

Further, the car navigator 920 may have its own antenna 937 for each radio communication system. In this case, the antenna switch 936 can be excluded from the configuration of the car navigator 920.

Battery 938 provides electrical power to operate each unit of in-car navigator 920 shown in FIG. 18 through a feeder line, which is partially shown in the drawing as a dashed line. Further, this 938 battery stores the electrical energy from the vehicle.

The technology according to the present invention can also be implemented in the form of an internal automotive system (or on a car) 940 containing one or more units - a car navigator 920, an internal network 941 of a car, and a car module 942. This car module 942 generates data regarding a car such as vehicle speed, engine speed and fault information, and transfers the data generated by it to the vehicle's internal network 941.

Further, the effects described in this description are only illustrations or examples, but in no way exhaustive or limiting. In other words, together or instead of the above effects, the technology according to the present invention can provide other effects that are obvious to those skilled in the art from the present description.

In addition, the proposed technology can also be configured as follows.

(1) A terminal communicating with a base station and containing:

a high-level processor module, configured to effect one or more SPDCCH settings via higher-level signaling from the base station; and

a receiving module, configured to monitor an SPDCCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by SPDCCH settings and SPDCCH settings,

in which the SPDCCH is transmitted using one or more control channel elements,

such a control channel element is formed by several groups of resource elements, and

in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is specified in association with a symbol in that pair of resource blocks.

(2) A terminal according to (1), in which the number of resource element groups formed in each of the pairs of resource blocks is equal to the number of symbols in this pair of resource blocks.

(3) A terminal according to (1) or (2), in which the demodulation reference signal associated with the SPDCCH is mapped to all resource elements included in a given subcarrier in each of the pairs of resource blocks specified by the SPDCCH setting.

(4) A terminal according to (1) or (2), in which the demodulation reference signal associated with the SPDCCH is mapped to resource units of two consecutive symbols, including a symbol corresponding to the resource unit group used to map the SPDCCH in each of the pairs of resource blocks specified by the SPDCCH channel setting.

(5) A terminal according to any one of (1) to (4), wherein the SPDCCH setting contains information indicating the number of symbols in the extended subframe.

(6) A terminal according to (5), in which the number of control channel elements used to transmit the SPDCCH is determined based on at least the number of symbols in the extended subframe.

(7) A terminal according to (5), wherein the number of resource element groups constituting a control channel element is determined based on at least the number of symbols in the extended subframe.

(8) The terminal according to (5), in which the configuration of the resource unit group in each of the resource block pairs is used for all groups regardless of the number of symbols in the extended subframe.

(9) Base station communicating with the terminal and containing:

a high-level processor module, configured to effect one or more SPDCCH settings in the terminal through higher-level signaling; and

a transmitting unit, configured to transmit an SPDCCH transmitted based on an extended subframe with fewer symbols than the number of symbols in a normal subframe and a resource block specified by SPDCCH settings and SPDCCH settings,

in which the SPDCCH is transmitted using one or more control channel elements,

such a control channel element is formed by several groups of resource elements, and

in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is specified in association with a symbol in that pair of resource blocks.

(10) A communication method used in a terminal in communication with a base station and comprising:

a step of making one or more SPDCCH settings by means of higher layer signaling from the base station; and

a step of monitoring the SPDCCH channel transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by the SPDCCH channel settings and based on the SPDCCH channel settings,

in which the SPDCCH is transmitted using one or more control channel elements,

such a control channel element is formed by several groups of resource elements, and

in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is specified in association with a symbol in that pair of resource blocks.

(11) A communication method used in a base station in communication with a terminal, and comprising:

a step of making one or more SPDCCH settings in the terminal by means of higher level signaling; and

a step of transmitting an SPDCCH channel transmitted based on an extended subframe with fewer symbols than the number of symbols corresponding to a normal subframe and a resource block specified by the SPDCCH channel settings and based on the SPDCCH channel settings,

in which the SPDCCH is transmitted using one or more control channel elements,

such a control channel element is formed by several groups of resource elements, and

in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is specified in association with a symbol in that pair of resource blocks.

Reference designator list

1 - base station

2 - terminal

101, 201 - high-level processor module

103, 203 - control module

105, 205 - receiving module

107, 207 - transmitting module

109, 209 - transceiver antenna

1051, 2051 - decoding module

1053, 2053 - demodulating module

1055, 2055 - demultiplexing module

1057, 2057 - radio receiving module

1059, 2059 - channel characteristics measurement module

1071, 2071 - coding module

1073, 2073 - modulating module

1075, 2075 - multiplexing module

1077, 2077 - radio transmitting module

1079 - Downlink Reference Generator Module

2079 - Uplink Reference Signal Generator Module

Claims (31)

1. A terminal communicating with a base station and containing: a high-level processor module, configured to perform one or more settings of the second physical downlink control channel (SPDCCH) through higher-layer signaling from the base station; and a receiving module configured to monitor an SPDCCH transmitted based on an extended subframe of fewer symbols than the number of symbols corresponding to the subframe and a resource block specified by setting the SPDCCH channel based on the setting of the SPDCCH channel, wherein the SPDCCH is transmitted using one or more control channel elements, a control channel element is constituted by a plurality of resource element groups, and in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is defined in association with a symbol in the specified pair of resource blocks. 2. The terminal of claim. 1, wherein the number of resource element groups formed in each of the pairs of resource blocks is equal to the number of symbols in the specified pair of resource blocks. 3. The terminal of claim 1, wherein the demodulation reference signal associated with the SPDCCH is mapped to all resource units included in the specified subcarrier in each of the pairs of resource blocks specified by the SPDCCH setting. 4. The terminal of claim 1, wherein the demodulation reference signal associated with the SPDCCH is mapped to resource units in two consecutive symbols, including a symbol corresponding to the resource unit group used to map the SPDCCH in each of the resource block pairs, specified by the SPDCCH channel setting. 5. The terminal of claim 1, wherein the SPDCCH setting comprises information indicating the number of symbols in the extended subframe. 6. The terminal of claim 5, wherein the number of control channel elements used to transmit the SPDCCH is determined based on at least the number of symbols in the extended subframe. 7. The terminal of claim 5, wherein the number of resource element groups constituting the control channel element is determined based on at least the number of symbols in the extended subframe. 8. The terminal of claim 5, wherein the configuration of the resource unit group in each of the resource block pairs is used for all groups regardless of the number of symbols in the extended subframe. 9. Base station communicating with the terminal and containing: a high-level processor module, configured to perform one or more settings of the second physical downlink control channel (SPDCCH) in the terminal by means of higher-level signaling; and a transmitting module, configured to transmit an SPDCCH channel transmitted based on an extended subframe with fewer symbols than the number of symbols corresponding to the subframe and a resource block specified by setting the SPDCCH channel based on the setting of the SPDCCH channel, wherein the SPDCCH is transmitted using one or more control channel elements, a control channel element is constituted by a plurality of resource element groups, and in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is defined in association with a symbol in the specified pair of resource blocks. 10. A communication method used in a terminal in communication with a base station, the method comprising the steps of: performing one or more settings of the second physical downlink control channel (SPDCCH) through higher layer signaling from the base station; and monitoring the SPDCCH channel transmitted based on the extended sub-frame of fewer symbols than the number of symbols corresponding to the sub-frame and the resource block specified by the SPDCCH channel setting based on the SPDCCH channel setting, wherein the SPDCCH is transmitted using one or more control channel elements, a control channel element is constituted by a plurality of resource element groups, and in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is determined in association with a symbol in the specified pair of resource blocks. 11. A communication method used in a base station in communication with a terminal, the method comprising the steps of: performing one or more settings of the second physical downlink control channel (SPDCCH) in the terminal by means of higher layer signaling; and transmitting the SPDCCH channel transmitted based on the extended subframe with fewer symbols than the number of symbols corresponding to the subframe and the resource block specified by setting the SPDCCH channel based on the setting of the SPDCCH channel, wherein the SPDCCH is transmitted using one or more control channel elements, a control channel element is constituted by a plurality of resource element groups, and in each of the pairs of resource blocks specified by the SPDCCH setting, the resource element group is determined in association with a symbol in the specified pair of resource blocks.

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